So, you said you wanted to go to MassArt? For a portfolio, include a good mix of studies from life with the sort of thing you really want to focus on. There's no pressure to decide on a major right away, of course...you don't register for a major until February of your freshman year.
Freshman year = studio foundation, which can be tedious if your high school had a great art program. Some of the teachers are jerks, but others are really great. I guess that's true of any college.
If you're living on-campus your freshman year, definitely go for the Artist's Residence instead of Smith Hall. Way more living space, and it's apartment-style, so you share a living room and kitchen with 3 or 4 other people. Housing isn't guaranteed after freshman year, and there are very few spots for upper classmen, so your best bet for that is to go apartment hunting around March of your freshman year. I just had to go through that...stressful, but I found a place.