Go to the library and sign up for the summer reading program. I signed up my kids and me and already, my daughter has been through a dozen books and she's only been out of school for a week. A dozen chapter books and she's only going into kindergarten. She threw a fit yesterday when I told her we might not be able to get books as I forgot my card. We still got books.
What is your area of interest? If you are creative enough then do some mural works, if you are good at cooking - take some cooking classes and same goes for paintings and stuff and you can also start your own summer camp at home.
go on swimming pool near to your place.
go to a thrift shop with friends and buy some cheap clothes, then go home, customize, and have a fashion show!
just go to pinterest.
You should just have fun with friends and family.
Can you give us more info?
I don't have any money all my friends work any ideas of what I can do this summer