I would definitely recommend driving Trail Ridge Rd. between Grand Lake and Estes Park. This is a great drive through the entire park with lots of great pull outs and stops along the way. Be aware that this is the highest paved road on the continent at over 12,000ft. elevation and altitude sickness affects 50% of the visitors. Trail Ridge Rd. is very scary to drive if you're not used to curvy roads with no guards rails. Without stops, it will take 1.5hrs to drive from town to town. Because we stopped so much, it took us 4 hrs to get from Estes Park to Grand Lake, we ate dinner in Grand Lake and then it took us 1.5 hrs to drive straight back.
The Pool is a large turbulent water pocket formed below where Spruce and Fern Creeks join the Big Thompson River. The winter route is along a gravel road, which leads to a trail at the Fern Lake trailhead. Along the route are beaver-cut aspen, frozen waterfalls on the cliffs, and the Arch Rocks. The trail to Alberta Falls runs by Glacier Creek and Glacier Gorge.
We ended up doing Sprague Lake, which is a nice, leisurely walk along a paved path by the lake. It was a beautiful view. I only wish it wasn't so cloudy that day. Next, we drove to the Copeland Falls trail, which is a 0.3 hike from the trailhead of Wild Basin. But to the falls and back is a bit over two miles. Barely anyone was on the trail, which was nice but also creepy at the same time.
The park is home to some 2,000 to 3,000 elk in summer, and between 800 and 1,000 elk spend the winter within its boundaries. Because of lack of predation, the National Park Service culls around 50 elk each winter. Overgrazing by elk has become a major problem in the park's riparian areas, so much so that the NPS fences them out of many critical wetland habitats to let willows and aspens grow. The program seems to be working, as the deciduous wetland plants thrive within the fencing. Many people think the elk herd is too large, but are reluctant to reintroduce predators because of its proximity to large human populations and ranches.
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