The state parks near/on Seeley Lake, not far south of the West Glacier area, are really nice. Bannack SP, sw MT about 20 miles west of Dillon, is a neat visit - an old mining town/ghost town but only finally abandoned in the 1960s so it's in better shape than many. They have a CG (state park), no hookups, but sites seemed rather small. We have a 28' and I'm not sure we'd have fit in there. (We camped at a private CG we like in Dillon: Countryside. Totally open, no shade, but nice view and pretty quiet.)