I think the Missions are a must. Built in the 1700s and now a National Park site. Pretty cool stuff. The river walk is WAY WAY WAY overrated, overpriced, and overrated. Did I mention overrated?
San Antonio Missions National Historical Park - San Antonio Missions National Historical Park
The only good thing about the River Walk is that it's about the only place I know of that it's legal to wander around drinking booze.
That's interesting. I thought the whole complex was owned by TexasBe aware that some buildings on the Missions premises have strange signs I've never seen anywhere else saying it is a federal crime to carry a firearm there, licensed or not. Keep your eyes on the doors.
The Alamo is owned by Texas, but their is several missions on the trail of missions, those are national parks.
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The Texas Hill Country. Get on Rt 16 west out of Helotes and eat dinner at the Old Spanish Trail in Bandera. It's about a 45-minute drive but don't go too fast as you'll miss some beautiful scenery. Probably everyone in the OST will be carrying, so don't worry about it.
For everything else, see here.
Enjoy our wonderful town!
Cheers! M2