My Utah Handbook by Moon Publications shows a large number of campgrounds along the Mirror Lake Highway, UT 150. My memory recalls it as pretty scenic, and nice to visit. The road is fine, not too many services though, at least back in 1979. It says it gets crowded, though it is now off season. Don't know about mosquitoes, and I guess there are bears and mtn lions. Maybe check with the USFS, they seemed to know a lot.