In volleyball, you can usually play for the school, but if you want to play outside of school, you may have troubles finding a league to play for. There are probably a couple leagues in Maryland where you live, but how close to the city you're in will vary. I mean if you really wanted to play, you could drive the extra distance to go there or you may have to convince your parents to take you if you can't drive.
If you live in the Maryland area, it has some great indoor volleyball places. For Maryland indoor volleyball, I'm going to more or less just give you some leagues because most likely you'll be playing on them if you're doing indoor. You might want to check out the Mid-Atlantic volleyball that includes DC, Delaware, Maryland, and the northern part of Virginia to see what they're like. Or you can check out this website, mavolleyball.org and it contains different clinics and tournaments that you can get involved in.
However, if you want to take a break from Maryland indoor volleyball and you don't want to try another sport or drive, you need to keep your skills up for the following school year. You could do some volleyball drills if you had the place for it and if you were a setter, you may want to try going to some volleyball setter camps on the off season.