Yes there are things to do. The Raritan Valley Line (RVL train) goes straight to Newark Penn/New York Penn. Even if you don't want to go all the way to NYC, you can take that train to Newark Penn Station and then the Path train to Hoboken or Jersey City. You 1000% have options in NJ.

Edit: I feel like I should add that the RVL stops at Raritan and Somerville (among other towns, such as the one that I live in). All things considered, it's pretty efficient and runs on the weekends.