Thank you all for the wonderful advice. The situation I was in was largely due to the fact that the school had given a very early deadline to RSVP. After receiving information about the open house I was given 6 days to make a decision, and since they were reimbursing all travel costs, and at the time it was the only school I had been accepted to I thought why not. Since then I, very surprisingly, got into both of my top choices. You guys gave wonderful advice from both sides so I'm gonna sit on it for a few days but if I decide not to go, just reject the program entirely in order for other students to get a chance. I just wish they had given more time for students to RSVP!