We decided to stay and extra day and take in some more sights, because 3 days after checking into our no tell hotel (Quality Inn off of I-10 in the medical area) and unpacked, we didn't have time to do anything else other then go to Wal-Mart, which luckly was behind the hotel.
On day four we went to see The Missions and had a wonderful tour guide that really pulled you into the history of Mission San Juan. This by the way was free. Then we drove about 5 miles to see Mission Concepcion, which is also beautiful, but nothing like Mission San Jose. If you only get to see one Mission, other than the Alamo, I recommend that you go to San Jose.
Just to let you know, other than our hotel room, which we did get a different room after the first night, Our trip only cost us $350 with gas included from Dallas area to SanAntonio. There are alot of deals to find in SanAntonio if you will just spend a little time to look.