It is best to rent a car as Maui does not have extensive public transportation. The island is relatively accessible with the main highway, Hana Highway, leading to many popular tourist destinations. Expect to spend around $250-$350 for a 7-day car rental, depending on the car's size and model.
If you have more time, you can add a kayaking tour of the coast and explore the island's numerous valleys. For those with less time, consider narrowing down your itinerary to your "must-see" locations. During peak season, book popular tours and activities in advance. Also, check out food trucks for a delicious and affordable meal.