I have really started to like slower travel. I love spending a week in an interesting city. You wander around. Sunday's are especially fun to just spend it like the locals spend (especially in Europe where they know how to spend a Sunday). Just chilling in a city park or following the local crowds to where they are all headed. I like it during solo travel as I just do whatever I want.
There is something so relaxing about unpacking your suitcase for a few days in a hotel and not rushing around trying to hit every spot. I'll be back. And if I won't be back, I'll be someplace else fun.
Some of my favorite days on trips are where I wander with no agenda, no 'sights' to see. Wandering through neighborhoods, city parks, taking transit to interesting parts of the city just to see whats up. People watching. Beer gardens. Cafes. Naps.