We used the Kauai Bundle & the Oahu Bundle of Shaka Guide. Both were terrific! We never got lost while using it either. It worked great with my phone, easy to understand, interesting stories of the islands & locations, fun humor, and took us to several very cool places off the beaten path that ended up being some of our favorites. Highly recommend. Each tour also has Tour Stops & Maps & Highlights & Tips. You can pause, resume, close, or join a tour at any point along it. It was also useful as a GPS tracker even while the tour was paused.
We did all 4 Kauai tours plus returned to some of our favorite new spots the last day.