The River Walk is full of stuff you'll enjoy seeing and doing. Sea World is always a favorite, and there's another amusement park there near it. And there's the Alamo and other historic sites. San Antonio is a blast. You will have a great time, I'm sure. I'll move this to our Texas area so perhaps some San Antonio natives will respond with inside tips. I'm from the Dallas area but have loved San Antonio since I was a kid.