I was just up there over the 4th, explored some last year too. The top of the mountains are broad with big flats of treeless lush green meadows and small lakes. There are narrow cliff bands and forested canyons dropping away and on a clear day you can see very far. It's like being on top of the world. Last year I went up Ephriam Canyon and took skyline north for several miles untill a huge snowfield blocked the road, turned around and descended to Joe's Valley Res. and followed the road below it down to Caslte Dale through a nice canyon, then returned on Hwy 31 (I Doubt there is a more scenic drive in all of Central Utah than Hwy 31 between Huntington and Hwy 89)
last weekend on the 4th I went up Ephriam Canyon again then went South on Skyline Drive, there was a bypassable snowbank at Jet fox Res which was a nice light blue kinda glacial lake look. I saw signs for the Manti canyon north and middle trails on respective sides of Jet Fox but decided to continue to the South/main Manti Canyon road since I didn't know the area.
The map on that link is great. Next time I go that way I'll have to check out all of the blue("jeep") trails with square boxes(more difficult). Looking at the map, there aren't any blue trails with diamonds(most difficult), whats the deal?