Did the entire loop in Mid October, unfortunately the fall color was late last year, but I imagine it would be superb if you got it at the right time. Best to hike the loop from west to east, starting at white rock imo. Some cool waterfalls and creeks on the west side and around Shores but the east side is mostly just a salty climb up WR Mountain. All n all, a good overnight loop that's really convenient.
It's actually the Shores Loop Trail - we started at Shores lake, went the east side up and camped overnight, came the west side down. West side was much prettier with the falls and creek than the east. Steep in places on the east going up, but overall a very nice hike and gorgeous views from the top of White Rock Mountain. Go all the way to the top and watch the sunset and do the rim trail. Worth it!
First, some "business" details: Clicking the directions link here will not take you to the trailhead. I'm guessing it takes you somewhere near the White Rock Cabins.
Using your map app to get to Shores Lake Recreation Area will get you where you need to go. There are some dirt roads, and the paved road into the recreation area is in bad shape in some spots, be warned. The camping area will be off to the right. There's a sign indicating the trail is that way. Follow the road a little ways into the camping area and you can park right next to the trailhead.
If you decide to park in the recreation area (this is easiest), there is a $3 day use fee (honor system). The restrooms are well-maintained!
If, for whatever reason, you need/want to avoid the fee, there are other places to park. I'd suggest an old road that goes off to the left. It's uphill after you pass the camping area, just before a really sharp turn. The trail crosses the road right here.
The good stuff: the trail is GREAT. There are rocky areas, trees to scramble over, bluffs, springs, the pretty little creek with lots of picturesque pools, and the waterfalls (just the main one had any water today). The scenery can't be beat.
The trail is pretty well-traveled - we passed three other groups - but it's a bit out of the way, so I doubt it's ever over-crowded. There's some steepish up/down, and the trail is a bit narrow at points, but it's mostly easy hiking. I'd say "moderate" is a good rating.
First, this is supposed to be the White Rock SHORE Loop trail. The White Rock RIM trail has signs pointing to it starting at the bottom of the mountain labelled White Rock and White Rock Loop Trail. If you follow the signs, you will end up at the wrong trailhead, and you better have a paper map to follow because you won't have the data service to double check the location online This trail starts at the (GIANT) primitive camp near the recreation area, not 10 miles up the road by the cabins. Sorry for being dumb about that, but I'm used to much clearer signage for trailheads.
Second, this was not a lightly trafficked trail. It might have just been that we chose a busy weekend, but despite only hiking about a quarter of the trail we encountered about 2 dozen people on it including 2 families with small children and a tour group.
Trail fee was unexpected and $3 per vehicle. This would probably be a much better hike in the spring when there is water coming down the mountain and a lake rather than mud puddles. The scenery was promising enough that we're thinking of returning in the spring to see if it's actually nice, but we'll see......