We've been camping at Button Bay for years, and while it can be hot and buggy in the summer months, there is no place we'd rather be in September! There are two campground loops to choose from. The first is where you'll find the lean-tos and the dog trail/beach. This area is super quiet, offers a bit of shade, and plenty of privacy. We almost always get the Catalpa or Willow lean-to because we bring dogs and it's easy for them to run to the lake and cool off.
The second camping loop has a few waterfront camping cabins, which we are dying to check out, but haven't yet. The main camping area is essentially a huge field, so not much shade or privacy. The benefit of this area is that it's closer to everything - the playground, pool, nature center, kayak and canoe rentals, and the trail out to the point. There are also amazing views of the lake and the mountains right from the camping area.
I think this is one of the best state parks in Vermont for families with kids, and for dogs. There isn't a great place to swim in the lake here, although plenty of people swim off the point. There is a nice pool, but it closes after Labor Day weekend. If you want to swim in Lake Champlain, I highly recommend Kingsland Bay State Park, just a few miles north.
Definitely hike the short nature trail out to Button Bay Point. It's especially lovely in the evening as the sun is setting. Enjoy!
