Summer leaves the student musician with two options.
1. Get completely rusty and sound like Dorky McDorkersons come September.
2. Be completely invigorated and sound like RockStar McAwesomepants come September.
Like Black Sheep said: the choice is yours.
Just a few summer music opportunities for kids:
UMD Youth Music camp (MD/DC)
Idyllwild Arts* (CA)
Ithaca (multiple programs, NY)
Philadelphia International Music festival (multiple programs, PA)
Sampling of summer music opportunities for adults:
Rocky Ridge (CO)
Of course this is not comprehensive. Feel free to include submissions in the comments section. Most programs have registration that closes in April.
*for advanced students only