I will be in visiting DC and NYC during January 07 (Jan 5-11 DC; 11-17 NYC). I was thinking of going on a day trip (same day return) or 1-night-trip (next day return) to Philadelphia (from DC) or Boston (from NYC). I dont know where to go. Which city has the best and vibrant nightlife, sightseeing, gay neighborhoods, museums, shows, etc etc... We have 25 yrs old and 20 yrs old , so any recommendations. I'm looking forward on not spending a lot of money in that trip. Advices? Hints? I think taking a train will be cheaper, isnt it?