The old town is probably nicer to look at than the Tequila tour is. The tequila tour is a quick one and this place only serves as a store for selling tequila, its not like you will be taken through any actual processing of the tequila.
This town has the oldest Church on the island. It is a nice small church. You walk through it and see how humble and clean it is. There are a few Mayan ruins next to the church. The small town has an old feel and the people are nice.