Campers & Counselors is a fun, very-true-to-lasers-and-feelings, Lasers & Feelings hack.
It definitely captures the feeling (and semi-regulated chaos) of summer camp, and makes for some fun, pulpy one-shot gaming.
There's two spots you might want to modify it slightly if you're running if for younger ages, but otherwise it's pretty all-ages friendly.
-Subheading, "leaving you to with no leader" leaving you with no leader
-GM, "befroe a threat dows something" before a threat does something
-GM, "have you seen the Aleins" have you seen the aliens