life size beer pong. 5 gallon buckets, red spray paint, and a volleyball as your pong ball
Have the moms, etc all bring blankets as a just in case. It'll be more visually interesting that none will match. Or we can see if some pretty ones go on clearance over the summer, and stick to a color range.
Smores In A Basket- this would be good to give guests at a beach wedding where there could be a bonfire on the beach afterwards
Floating lanterns instead of fireworks - we can all write wishes messages and ideas on them before sending them p to the sky.
Invite your friends to a bonfire party with DIY s'mores kits.