Depends what you want out of the TY. Are you doing it to help yourself get a competitive residency post-MS4? Then try to do it at a place with that residency, specifically one with a track record of taking TY. Do you want a cool location for a once in a lifetime experience? Go to Tripler. Most of the other locations (minus Madigan) are in pretty crappy locations. Eisenhower is within 2-3 hours of Atlanta, Charleston, Savannah, Columbia (SC), Hilton Head, etc. DC is cool for all the sites and museums if you've never been before. Not sure I'd want to do a TY there. I think I'd rather just go on a vacation there later in life on my own dime.
Realize that if you do a TY, chances are very high you will be moving after that year. So if you go to a place like Tripler, the big decision is whether to bring all your stuff or just leave it in storage for a year.