hey john

There are no taxes on the interest you make in the banks, just find a large chain bank in DR, you can leave it in US money and depending how much you put in, they will give you 8% to 11% tax free interest or change it to pesos for 16% to 20% interest.
Good luck
P.S> also there are no taxes on your house if it is worth under a certain amount wich I am not certain.
see ya