We spent five nights in October and that was about right for us. Much of what we did was south of the city so we did not have to spend a lot of time driving. We took our bikes and did the three Missions south of us and we drove up to the mission closer to town. We did the River Walk (not impressed) and did the boat ride (city needs to seriously clean the river) the restaurants in the River Walk area are all tourist oriented. We visited the Alamo and toured the area around it. We met up with friends so we did not have time to go to the Mexican Market or the Buckhorn Hall of Fame.