Elephant March as a 15 Minute to Win It Party Game. Put baseball in pantyhose leg. Put pantyhose on head. Knock over the bottles with said pantyhose/baseball combination~ but you can’t use your hands.
Indoor Golf - rainy day activity (Can be turned into mini golf - use large gift wrap tubes for tunnels, large beanbags or small pillows as obstacles, etc.
Design your own fabulous flipflops, make several pairs into funky bunting or summer wall art.