Throw a Stick of Sage into the Firepit/Bonfire. The sage scented smoke that the fire will emit keeps mosquitos and other annoying bugs at bay for the entire area. Usually the sage stick is enough, no need for bug sprays.
"Line your cooler with Reflectix (aluminized bubble wrap). Use Reflectix to keep the heat out and the cold air in coolers. Cut the Reflectix into pieces that fit, lining the inside of your cooler, including the top/lid.
Super Cheap, Lightweight, Full Size camping Sink - this dish washing sink is perfect for outdoor water activities. Use a drain from Home Depot and attach pool hose so it drains away from your camp kitchen, tent, or campsite.