Driving Trail Ridge is an absolute must. Leave early in the morning for wonderful scenery - not washed out from the sun - and to be ahead of the traffic.
I cannot really say for sure on the campgrounds in the Park as I have never stayed at any. But Moraine gets lots of high marks. I don't know how badly they were hit with the storm that devastated lots up there. No matter where you stay; make reservations - well ahead of time.
Just so you know. Estes Park itself is at 7500 feet at the lake. Much of the hiking in Rocky is at least 9000 feet and one major trailhead (Bear Lake) is at 9500 feet - and you go up from there.
Here is a list of trails ............
http://www.nps.gov/romo/planyourvisit/list_hiking_trails.htm
The hike from Bear, Nymph, Dream to Emerald is not real long but is wonderful.
Then there is lakes Mills and Jewel to Black - love that one.
Or up past The Loch, Lake of Glass to Sky Pond.
Toughest hike - thought so by many - is Flattop also out of Bear Lake. If you really have it in you go up to Hallett Peak; this was one of our favorites for sure - BUT TOUGH!
One of the most beautiful and 4 eco zones is to drive up past the Alpine Visitor Center on Trail Ridge 4 miles to Milner Pass. You hike form Milner Pass up to the Vis Cntr for a nice coffee or whatever and then back down. This will take you across the end of Forest Canyon - what you are looking at when you stop at Forest Canyon Overlook which is a great viewpoint on Trail Ridge Rd.
If you need more, go hike Twin Sisters - the most beautiful panoramic view in the Park. Well, Hallett's Peak is close.
We have hiked to the Boulder Field and The Keyhole and Chasm Lake down on Longs Peak as well. Have not summit'd it though. (We have gone to 14,000 feet by doing Pikes Peak as ahike up the Barr Trail - something I also ran twice at ages 48 and 52 as a half marathon).
That should give you something to chew on for a while! :-)
