Theodore Roosevelt Island is pretty cool. I know you’re probably not into presidential monuments, but this is mostly just a nature park with a monument in the center of the island. Has some nice trails. Unfortunately I think you have to drive there though, although maybe you can get there from the Rosslyn metro stop? No idea.

Museum of the American Indian. I actually have not spent a whole lot of time there, but I went there for an indigenous peoples conference once and looked around briefly and it seemed pretty nice, so probably worth checking out.

Across the street is the United States Botanic Garden which is extremely impressive. Took my at-the-time girlfriend there once and she loved it, and I was surprisingly impressed also since I’m usually not that into gardens.

Now quite a bit outside of DC is the Great Falls. You’d absolutely have to drive there and that might be a little too far out of your way but I highly recommend it, it’s a really impressive park, the falls are beautiful and you can climb around on the rocks which is fun.

For nightlife, head to H Street. I’m not sure how gentrified it’s become at this point, when I lived there it was very steadily pushing east. If you go to the United House of Prayer for All People though, what they used to do is every I believe it was Friday night, they’d have a big fish fry on the street. Fried whiting or shrimp (the shrimp is better imo) with hushpuppies and fries and homemade pink lemonade. Absolutely delicious. Not sure if they still do this though, but I hope they do cause that shit was amazing.