"I was wondering what kinds of things are there to do around the campus?"
You have a world class nightclub within a two minute walk. Depending on your dorm, you can probably see into Fenway park. The Prudential Building overlooks our campus. You're right on the Charles river. You're also a fifteen minute walk from Newburry Street. You're also a five minute walk from AMC theatres, which is right next to Cold Stone Creamery, which is the best ice cream I've ever had.
I think you'll be fine
As Chriss0620 menioted, walking/running along is Charles is highly recommended. You can take a foot bridge to cross over Storrow (pronounced Stir-row...get used to pronouncing things funny) to get to the Esplanade.
Anything specific you're looking to do?