[EricH]

Egg drop. Paper, string, candy, cotton, tape, stuff like that in a bag. Each group (or individual or subgroup) gets one bag and has to keep the egg from breaking when dropped from a given height. You choose your own materials. most drops without breaking or farthest drop without breaking wins.

Rubber band airplane flight: who can send the thing the farthest. One balsa-wood rubber band-powered airplane per person/group. Wind it up, let it fly. Winner goes the farthest.