Phil,
I think the State Park folks would be more knowledgeable to provide your answer as to hikes...there are some privately owned land issues in play , as well as fencing off of restricted areas. That having been typed ..the park sure does get a large amount of "day use " hiking.
re: The Artic Fox propane use for heating... we set the Coleman Mach thermostat at 65-68 (auto) and just bundled up ... it was very comfortable...two teenagers kicked off the covers at night. Skylights iced over... but interior windows did not fog up. Don't tell my bride, but I cracked open the small window near the head of the bed all night long. In eight days and nights of continuous use I consumed about 3/4 of one of the large propane cylinders. Comfortable, but not a sweat lodge. Our last night , the water in the hose leading up to the 5ver froze (from spigot to RV), so, it was chilly outside...(mid-to-high-20's). We were very pleased with the Artic Fox interior temperature control...although, to be honest, we both see a digital thermostat in our future.