Where can I go with my boyfriend?

We're both 13 and we've been together 3 months. My mom said he could come over tomorrow, and he's been over many times. She said she wants us to do something rather than just hang out at the house. We were going to go to the beach, but being that it's 4th of July weekend-not such a great idea! I'm not really into the whole like activity thing like roller skating and such, but I'm not into the movie idea either. So I mean I want to just do something fun.. any ideas? Please post anything you want! As much as you can too(: THANKYOU<3