We've been to Honolulu
several times, sometimes on vacation and at other times to attend conferences, so we've been to many of the local attractions. What we've not ever done is to spend time just looking around the city, so the HoHo Bus was perfect for us. We spent the majority of our full day in Honolulu using the bus to see the sights, getting off when there was a site we wanted to visit. The three bus routes intersect conveniently at an indoor terminal, and transfer service was frequent.
One of the routes we most enjoyed was the one that went out to the Diamond Head area, where we hadn't been before. There wasn't time for the zoo or aquarium, but there were scenic views, statues, and beaches to see.
The evening before we ate at a Honolulu restaurant we've enjoyed before, Alan Wong's. It's always an interesting experience!