I would look at renting a bus. They are experts in tours and fun spots for groups. Look At Polynesia adventure tours or Roberts Hawaii they both have buses. They do most of the moving of big groups. Don't want to plan some thing at Lydgate Park and tell everyone the time to meet there. Guarantee have of your party will be 1/2-1 hour late because of traffic flow. The bus will take you places as a group like the canyon, water falls , spouting horn and a bunch more. Look on the web for a planner and they could set everything up. Have fun, and when I see the bus going down the road with just married on it Ill give you a wave.^