Transportation in Maui is best by renting a car to cover most tourist locations, whether by the coast or within parks. You would need to consider an estimated $200-$400 fee for renting a car which would make traveling more comfortable and more convenient for your stay in Maui. For specific day tours, such as the helicopter tour and the snorkeling tour, providers will provide transportation for you.
If you have more time, consider adding a few extra days to your trip to include more day trips to other parts of the island, such as a trip to the Iao Valley State Park. If you have less time, consider cutting down on the number of day tours and exploring local beach areas or nearby restaurants in just a few days. Remember to plan your day around opening and closing times of your chosen locations to make sure you don't miss out on anything.