Me & my wife celibrated our 25th anniversary in Maui back in June. I rented us an Electra Glide Classic for a few days, and THAT turned out to be the coolest thing we did on our trip. If you haven't been, then riding a Harley on the road to Hana has to be on the top of your bucketlist along with a ride to the top of Haleakala volcano. We made a 2 day trip out of Hana Hwy, and stopped at every opportunity to enjoy the sites. Here's a few pic's
P.S. The wife thought I was nutz for packing my leather jacket to Hawaii untill we rode up the volcano. At just over 10,000 ft it's pretty nippy up there even in June