There's not a lot a Horseshoe Lake. It's a small 16 acre pond with a sordid history of leaking CO2 and smothering sleepers into eternal slumber. The trees are dead in a ring around the lake, where tragically a cross country skiier was killed when he encountered a nearly 70% concentration. Don't let that scare you though, he was in an ice cave in the winter. You'll be fine.
If you want solitude, you'll find it here. The lake is tranquil, kayakers like it, and the 1 mile loop around the lake is nice.
First come first serve on the campsites.