Since becoming sixteen only happens once and is a bit special we had a good old shindig for him, out in the front garden. Shockingly the sun shone for the entire day (it was one of the only sunny days we've had this summer!) which was perfect for outr outdoor party.
Now, in my opinion, one is never too old for a good bounce! So we hired a big adult sized bouncy castle, and some sumo suits for the crack. We erected a gazebo and filled it with air beds and cushions to create a sort of lazy area (which little Rosie mostly hijacked to keep out of the sun) and we kitted out the garage with food, helium balloons and music. Marty was in charge of the barbecue since he's obsessed with fire, and meat.