For what its worth, I spent a similar amount of money volunteering in a rural part of Mexico, and it was AWSOME. I took 2 hours of spanish lessons a day (included in program), improving my language skills far far faster than any course I could take in the states. In 5 weeks I probably learned at least a semesters worth of Spanish.
Also, I got to do some unique volunteer experiences, like going on malaria brigades, taking vitals for the doctors (because alot of the clinics were understaffed), and learned alot about medically related traditions. Because of the trip, I definitely want to participate in some form of international medicine if I end up in med school.
It didn't help my application much because I did it after I submitted my primary, but I have been mentioning it in interviews. Although none of my interviewers have really cared so far
I say go for it if your family has 4k to kill