A very nice loop, indeed.
There are quite a number of good training hikes in the San Jacintos. I don't have my maps with me right now but here are some thumb nail sketches, below.
San Jacinto Peak from Deer Springs trail, Marion Mtn trail, Seven Pines trail, or the PCT/Fuller Ridge trail. These all go through Little Round Valley which is less visited than Round Valley and in my opinion has a sort of interesting high altitude "flavor." The pull from LRV to the top is good training and will acclimatize you some to altitude. Fuller Ridge is the longest/hardest if memory serves me well. I don't reacall the trailhead elevation, but you might skip that one if the trail head is too low and therefore too hot. Each of these has a different mileage and go through some different areas to get to LRV, all worthwhile. You can make these a loop by returning via the east side of SJ and going to Strawberry Junction from Wellman Divide and then back to your starting point. Another interesting variant is to bag some of the off trail peaks like Folly, Drury, Marion, or Jean.
The DST route is a good one, a bit more gain than from the tram of course.
Another interesting one that I've done requires a big car shuttle: take the tram up, hike San Jacinto, exit to one of the western trailheads (Fuller Ridge, Seven Pines, and Marion Mtn) or the southern trailheads (Devil's Slide and Deer Springs). Or do it in reverse if you want more excercise (and enjoy "refreshments" at the top of the tram on the way out). Since you're local, it wouldn't be too hard to drive one car the day before to your exit point with a friend following you (who can drive you home), and then on the day of your hike, you drive to your entry point and then hike to your prepositioned car. If you want
really hard core, I guess you could ascend C2C to the summit, descend via LRV, and exit via Strawberry Jct on the Deer Springs trail. Now THAT's a hike!
There's other stuff that's interesting out there besides just the summit block of the San Jacintos (I guess that would be from Folly Pk to Jean Pk and include San Jacinto, Drury, and Marion). I did a neat hike one time from Humber park to Red Tahquitz and then south to South Pk and Antsell Rock. Antsell Rock has a cool class 3 stretch on it to get to the summit. I exited to the west through the Zen Center (you have to get permission in advance to go through the Zen Center). Some of that could be a little warm as the season progresses; keep you're eye on the weather reports of course for that one.
Just some ideas. I hope these are lucid. It's been a long week, and I haven't had my supper yet.
Happy trails,