A great way to familarize yourself with a new city is to take a tour.

For a quick way to see all the highlights of San Antonio, take the open-top bus tour, providing great views of major landmarks, an informative commentary and the ability to hop off wherever you like and hop back on after you are done. Tickets last for 24 hours, so there is no hurry.

Board at The Alamo and pay the driver or book in advance at City Sightseeing San Antonio

 If you prefer to stretch your legs you can take a walking tour such as detailed on tripAdvisor

 For something in between, the Segway tours are fun, surprisingly challenging to begin with but once you get the hang of it you will be speeding around town seeing the bits it is tricky to see from the road. More expensive than the other options, but you get a choice of tours. And the guides are great. Visit their website for more information  Segway City San Antonio