Chautauqua that both tourists and locals go for a good hike. You can see a small path leading up the grassy knoll (read: large uphill climb, just doesn't look it!) and those little specks are people.
It was very pretty in this park and I'd highly recommend it. Each day we packed granola bars, water, and some individual cheese packets for snacks and lunch was a shared smoothie at Jamba Juice to get our sugars up. I'm not too upset that we never went anywhere else because not only were there so many options to hike, but we had seen a lot of different areas of Boulder + country on our bikes. I would say if you're not a biker, at least try one of these hikes if you go there. You won't be disappointed, and your heart-rate will feel great afterward.