I'll second that!! If you make it to Comet Falls, it's only another 700 feet up to Van Trump Park, which is legendary. Just pretty in all directions. And you'll want to explore a bit :).

Another Mt Rainier tip. When you are parked at the Reflections Lake parking, right across the road is a delightful trail up to the summit of Plummer Peak. It is an easy 1,500' climb, with a great summit, which looks across Reflection Lake to Mt Rainier itself, rising a good two miles above you :). In fact, if I had a choice between the Reflections Lake loop trail and Plummer Peak, I'd do the peak in a heartbeat. You can always walk down to Reflection Lake and get a feel for it by walking along the shore for a few feet. And then head for Plummer Peak :).