San Antonio actually has five main relics, from Mission Espada on the southernmost side to Alamo in the city centre, connected by mission trail. Every relic is not far apart if it's driving, except Alamo in the city centre, where there are parking places. If you want to hike or ride a bicycle, you can take Uber to mission Espada and then walk along the river to the city center, about 10 kilometers. Maps can be taken from Espada, and seals can be stamped to commemorate every relic. In San jose, there's a little film about history. All in all, it's a very worthwhile scenic spot to visit.