My son has participated in the 'Mini-Hawks' half day sports camps for the past two years and absolutely loves them.
What I love about these camps as that they are local (you'll find them at parks and schools near you), really fun, non-competitive and affordable.
They have programs for all different sports -- including soccer, basketball, baseball, etc. -- and the kids just have a blast. You can reserve a spot well in advance, but can usually squeeze in at the last minute as well if you get in a crunch.