Lemon Eucalyptus Oil is key to this all-natural solution which the CDC recommends as an effective all-natural bug repellent. Simply add 7-10 drops of the oil to a jar of water with lemon slices and a couple rosemary sprigs. Top with a floating candle and set outside.
Grab some flat stones from your yard (or get the nice ones at a garden supply store), give them a quick cleaning, and write a menu item on each with a white paint pen. You can also use them as place cards or napkin weights on a breezy day.