Baseball help!

Hobbyists, I'll be coming to DR in April from the 21st to the 25th. Now this trip is going to involve a lot of mongering at all points of the day, but I also like doing some other activities on the side.

That being said, my friends and I would really like to check out a baseball game involving two good local teams. We get to see the local talent, and there's nothing like watching a baseball game and drinking some presidentes.

Anyone have any tips on how to go about getting tickets?