Electric/heated cabins felt brand new - include WiFi, a metal fire pit, outdoor cooking area, and a small raised deck overlooking the woods. The shared shower facility was clean, warm, and easy to get to at night. The Onamani trail was great for birding and wildlife viewing - my hike included porcupine, snowshoe hares, all sorts of birds, deer, and some fresh black bear tracks.
The park is still being developed and several trails were under construction. I was also there during the off-season, so many areas were closed down or blocked off. It was incredibly frustrating to go anywhere outside of the cabin area. The underground mine tours were closed (expected), but it wasn’t clear if/where we were allowed to park to go on the hiking club trail or do the self guided tour. The winter entrance had a sign saying that the road to the parking was restricted and the summer area gate was closed. I tried during daytime and after hours and eventually gave up.