We spent last week there June 6-10, 2007, about a third of the sites are 50 amp but if you're a large Montana the sites are limited. Trees close to the entrance of the site, trees close to the slide areas and posts make parking difficult. The lake is large, relatively clear and warm, the humidity is high and the bugs are plentiful.
Inks lake is close to Austin Texas so the liberal crowd is out there. Unfortunately, that generation of peace-niks are middle aged and should no longer wear bikinis!!
I'd avoid this one unless you're interested in middle aged folks wishing they were still in their teens. Was not a place for kids.