What to do with friend on rainy day?

My friend lives 45 minutes away and I don't get to see her a lot. What should we do? She's coming over in about half an hour and staying here for 2 night. I had a big tent that has 3 rooms so we would slleep in that. Its going to poor this 2 days so we can't do much. And we can't go anywhere like the mall because we don't have any money. Were 16 year old girls