i can't do august, but may be able to do the other dates. i'm on union lake, which isn't a bad lake either - huge sandbar where everyone ties up on the weekends. water is very clear & clean. the only problem is you might have to get to the pulic launch early on the weekends because parking is usually full before noon (despite having a pretty good size lot).

pontiac lake isn't bad either - i hear you have to be careful of stumps if you don't know the lake.

you'd have a hard time with walled lake because no public launch.

maceday lake is a great lake for boarding in - but not on the weekends - not sure where the tie up spot is tho.

white lake has a great tie up spot on a huge sandbar - i've never partied there, but i hear good things.