fish finder:I recommend May because it is the beginning of the wet season, but since it is the very beginning, it is not bad at all; maybe 1/2 hour to 1 hour a day. But because it is the beginning of the wet season, the prices drop quite a bit. We have gone twice in May and pay quite a bit less for lodging.
Except for the thimble jellys....dont get them as much on the west side as the north but they can be a real pain. I know many DM's who wear hoods during the whole late spring season.