For the poster above, Pedro Martinez's hometown is Manogayabo, which is just northwest of Santo Domingo. He has built houses, a church, ballfields, etc... The NY Times did an excellent article about him and his Dominican roots in December 23, 2004 issue, which you can probably find online in the NY Times archives.
Speaking of which, the NY Times just this week did an article about how Robinson Cano is buying an ambulance for his hometown of San Pedro de Macoris, which you can find the story at this link
A Yankee Needs an Ambulance, to Help His Home Country - New York Times
I also know that former player Tony Fernandez has a Christian based foundation for children in the Dominican Republic. They have a website at ttfoundation.com.
Also, a former player named John McCarthy along with Pepe Frias run a baseball camp in the Dominican Republic for underprivileged kids. Info for them can be found at
About Home Run Baseball Camp
I also read in the David Ortiz autobiography about his numerous charitable activities related to kids and health care in the Dominican Republic. I forgot the name of the book, but I think it's just called Big Papi - I'm sure one can find it on Amazon and read up more about all of what he does for kids.
Sammy Sosa also did lots through the years too. Although I had heard that his charitable foundation had run into some kinds of trouble years ago, I'm not sure exactly for what or if any of the reports were ever true or verified, but he of course gave lots to help in the recovery of Hurricane George, and has given hundreds of computers to schools in the Dominican Republic over the course of his playing career.
Finally, I know that Albert Pujols's foundation is related to children with Downs Syndrome - his adopted daughter has Downs Syndrome, and the charity is building orphanages related to this cause, which you can read more about at
Pujols Family Foundation : Faith, Family & Others.
I know that I'm leaving out a lot of other players and their numerous charitable deeds, but this is a start anyway!