I'm excited about my first-ever trip to Hawaii in late April-early May but a bit overwhelmed. I'll be spending four nights on my own in Oahu adjusting to the time change and seeing the sights, then a week on the Big Island with a friend, then four more nights by myself in Maui. I'm a fit 60-year-old woman. My big questions: Where to stay in Maui, and best to split my time between two different locations to see more of the island? Necessary to rent a car? Necessary to join an excursion to Hana, and if so, which do you recommend? I fly into Kahului Airport. Thank you for your guidance!