Loved our adventures using Shaka Guide! Even though I'm a planner, we never would have seen as much researching the driving tours on our own as we did with Shaka.
We purchased the bundle and did 3 of the drives - Reverse Road to Hana, Sunrise at Haleakala and West Maui Coastline Tours. The Sunrise at Haleakala drive is easy, the other two not so much. The Reverse Road to Hana was good, we took it slow & steady, but a week after we did this part of the road washed away, so make sure you know the road conditions before going. The West Maui Coastline drive was insane - the roads are on the side of the cliff, many without guardrails and many were one lane, so if another car comes, someone has to reverse. This was white knuckle driving for sure! I wouldn't recommended the West Coastline drive, but the rest were great!
I love that the guide is upbeat and fun! He gives you the info on the spot before you arrive so you can decide if it's something you want to stop for. There's also sections to find food and other things.
You can download this ahead of time so even if you do not have signal or it's weak it will work off of your GPS. We also used Shaka for Kauai and it was great.
I can't imagine going to Hawaii without these guides!