Wife and I enjoyed the trolley tour of Honolulu. We did the Red trolley which covered the city and during September took up in to the mountain. The drivers were extremely knowledgeable of the city and surrounding area. Honolulu is hot so time your stop buses are approximately 1 hour apart and there is not much shade to hide from the sun.
Absolutely enjoyed my time using the 4 day all trolley lines pass to see Oahu, knowing the times and exact locations where the pick up and drop offs were, I could plan my days adventures accordingly. Highly recommend it, especially in the double decker trolleys, the best views up high above traffic, great for taking photos and videos of the beaches and sights. If you're a first time visitor to Oahu, the Waikiki Trolleys would be my recommendation to do to help you get familiar with the island.
This was excellent value for money if staying for a week in Waikiki. The five loops took you to parts of the island you would probably would have not got to see. We loved being able to hop on and off anywhere. We used the pink line like a taxi service. All the drivers were polite and informative. Aloha.