Heidelberg houses Detroit Heidelberg project (look up on Internet--may have a local spin you can put on it)
Mandy would like this: popsicle stick bracelets: boil in water for 15 minutes then place in cup to dry~this is cool!
Handmade Boats - cute kid's project, or make cute decor for a beach house (or a beachy feel)! Directions for origami boats to match your sailboats/rafts, too! Could jazz this up even more with candles, esp. if it's light enough for these babies to float in a whole ocean scene!