It is a small town just on the east side of Rocky Mountains National Park, and it serves as a main gateway point to getting into the park. There is kind of a central street for tourists, with lots of restaurants, shops, and some independent hotels. There's a little stream that runs along behind some of the restaurants. Other than using the town as a springboard into RMNP, I don't know that there's all that much. When we were there, there was a weekend festival of some sort, which we walked to from our hotel and enjoyed some free music. RMNP is very popular and crowded, so by virtue of proximity, so is Estes Park. Park reservations are required now. It's been nearly a decade since I've been, but even then (and even in off season), parts of the park were crowded enough that you had to park and use the park shuttle system to get to trailheads. My personal opinion is that I wouldn't stay more than a night there, as part of a larger road trip seeing more things in the area. For scenic places, RMNP is great, but there is a ton to choose from in that part of the country, and I prefer to get where it's much less crowded.