The trail itself is great for hiking and running. I try to hike the premier trail 2 times a week. If you start from the parking area by Shelter 1 and enter the trail at shelter 2 you will have 2 very significant inclines. At the 2.5 mile mark just past the creek crossing you will start a 3/4 incline in elevation a few places steep mostly just long. Then at the end of the trail about 100 yards very steep to the top. Fast hiking, trail is an old fire road.
Trail is in great shape (except for the occasional horse piles) and just beautiful. Lots of big fish (bass and panfish) in the lakes including what looked like a monster goldfish in Upper Lake. We'll be back again to see if we can tackle the perimeter trail.