The Alamo sits in the middle of downtown, and is an easy stop on your downtown San Antonio tour. Admission to the Alamo is free, but donations are appreciated.
If you are a history fan, you can't miss the Alamo. Even if you aren't a history fan, this is just an awesome place to visit. The large trees and landscaping is very beautiful. There is a free 20 minutes movie, made by the History Channel, that shows every 20 or so minutes. If you are short or have kids, put them down in the front rows because you will not be able to see the tv in the front of the room.
Plenty of things to purchase in the gift shop to remember your trip. I will say that you can get a lot of the items across the street in some of the corner shops and drug stores for 10-20% less than you'll pay for them in the gift shop, but since all the proceeds from the gift shop go toward the preservation of the Alamo I didn't mind.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.