It's Summer and the USYVL season doesn't start until September.

If there is a USYVL summer camp near, that is a great opportunity to sharpen your volleyball skills.

For the rest, take out your volleyball and grab a friend to work on the basic skills.  Passing and setting can be done without a net.   

You can check your local park or school for a volleyball court to practice your serving and hitting skills.  If you gather enough friends, play a game of volleyball.