I'm glad we're discussing this, because even though it seems like a trivial point, I've always wondered about this.
Scott, I think there's one point of disagreement. As far as I understand, there are various kinds of "forced placements." But some are not "player's turns," and some are.
Example #1) If playing with only the basic game, the OST is placed first, and is not considered anyone's turn (no followers may be placed).
Example #2) If playing with the basic game and River I, the spring is placed first and is not anyone's turn. However, once the river is completed, that lake is placed by the next player...so although that lake tile is forced upon the player, it does count as his turn, and he may place a follower on the lake tile. At least, that is my interpretation, and it explains why the rules explicitly state differently when discussing the volcano tile. If, at this point, after the lake tile is placed, you choose to go with the OST tile next, that would again be a player's turn. (I thought the original River I rules state you should disregard the OST when playing with the River I, but if not, I'll probably just mix it in with the remaining tiles from now in.
Example #3) If playing with the basic game and River II, the spring is placed first and is not anyone's turn. Immediately following this, the river fork tile is a "forced placement" for the youngest player, but that does count as his turn, and a follower may be placed (I believe). Then, the river is built. Now, at this point, there seems to be some ambiguity. If the volcano tile is one of the two lake tiles being used, then after the river tiles are used up, the non-volcano lake tile is a "forced placement" for the next player, and that does count as his turn, and a follower may be placed. Then, the next player must place the volcano lake tile, and while that is his turn, no follower may be placed (because of the special exception for the volcano tile), and therefore there is another exception allowing the same player to immediately draw and place another tile, on which he may deploy a follower.
However, if you're not playing with the Princess and the Dragon, but with both the River I and River II expansions, you must "remove one spring tile and one lake tile," because you should now have two springs and three lakes (including the volcano, and of course, not including the GQ expansion). So, if you choose to use the two non-volcano lake tiles, then once the river is finished, there doesn't seem to be an official ruling as to how the next player chooses which lake tile to draw and place. According to my interpretation, whichever lake tile is chosen, it definitely counts as the next player's turn, and a follower may be deployed. The issue is, it makes a big deal if the next player gets to choose which of the two lake tiles he gets to place (because one of them has a city segment, I believe). But nowhere in the rules does it state that one of the two lake tiles must be placed last (if you're not using the volcano). So my guess would be that, as it currently stands without an official ruling, the next player would have to draw blindly from the two lake tiles face-down. Then the next player would be forced to draw and play the other lake tile, which would still be his turn, and he could deploy followers. Then, you're back to the whole question of whether to play the OST next or to mix it in with the remaining tiles.
Sorry if this is long-winded, just trying to clarify the question.
In summary, this is my understanding:
If you're playing
Basic GameOriginal Starting Tile - Automatic placement, not a turn, no followers deployed.
Game then begins with youngest player choosing from the remaining pile.
Basic Game with River ISpring Tile - Automatic placement, not a turn, no followers deployed.
Youngest player begins by choosing from River tiles.
River completed.
Lake Tile - Forced placement upon next player, counts as turn, followers deployed.
Game continues with the
next player choosing from the remaining pile (possibly containing OST?).
Basic Game with River IISpring Tile - Automatic placement, not a turn, no followers deployed.
River Fork Tile - Youngest player begins by being "forced" to place the River Fork tile, counts as turn, followers deployed.
The game continues with the next player choosing from the remaining River tiles.
River completed.
Non-volcano Lake Tile - The next player is "forced" to play this tile on either of two path-ends of the forked river, counts as turn, followers deployed.
Volcano-Lake Tile - The next player is "forced" to play this tile on the only remaining incomplete river end, counts as turn, followers may not be deployed, player allowed to draw and place again, followers deployed on new tile.
Game continues with the
next player choosing from the remaining pile (possibly containing OST?).
Basic Game with River I and River II (One spring is chosen, even possibly the one from GQ, and two of the three lakes are chosen.)
[If one of the two lakes chosen is the volcano Lake tile, follow the same procedure as for above (Basic Game with River II).]
If both of the non-volcano Lake tiles are chosen to play with, then:
Spring tile - Automatic placement, not a turn, no followers deployed.
River Fork Tile - Youngest player begins by being "forced" to place the River Fork tile, counts as turn, followers deployed.
The game continues with the next player choosing from the remaining River tiles.
River completed.
Next step is in question until clarified. My guess would be the next player draws "unsighted" from the two lake tiles face-down, then plays the drawn lake tile on either of two path-ends of the forked river, counts as turn, followers deployed.
Then, the next player is "forced" to draw the other remaining lake tile and place it on the only remaining incomplete river end, counts as turn, followers deployed.
Game continues with the
next player choosing from the remaining pile (possibly containing OST?).
Do I have this right? This is moot, of course, if it's official that when using River I and River II, both of the River II lakes are supposed to be used...but I was under the impression you merely "disregarded one spring and one lake," which would mean you could choose which spring and which lakes you want to play with. There's not much point to playing with the volcano if you're not playing with the dragon.