here is a list for you to

2 days in Oahu(half day in Polynesian center, half day in southeast corner, half day in north shore, half day for snorkeling)
3 days in Maui(1 day snorkeling in molokini, 1 day to Hana highway, half day to the mountain top, half day to drive around)
1 day in Kauai (half day for the canyon, half day to drive around the island)
1 day in big island for the volcano

Forget about the stupid conference.