I'm new to RPGs and I'm interested in having a discussion of some game design topics I need help with. I've learned that subjective discussion questions are off topic here. I'm willing to join a forum, but there are so many and I really don't want to join a bunch that are inactive or not really maintained.
So, can anyone recommend a forum that is active that I might join to discuss such things as mass combat, multiple combined spell casting, underwater adventuring, and aerial adventuring? This is all for Pathfinder and 3.5, so if the discussion board does not include Pathfinder, I'm not interested.
UPDATE: I've added just a bit of additional text to clarify that I'm looking for game design discussion, not a discussion of how to play or optimize said play.