There is a lot to do on the Big Island of Hawaii and we encourage you to plan to come early or stay late. Or both. While you're on the island you should plan time to see Volcano National Park. We will not be going to the volcano or over to Hilo during the tour - it's a big island and we want to minimize windshield time.
To help plan your trip, one of the best books I've found about the island is Hawaii The Big Island Revealed, by Andrew Doughty and Harriett Friedman.