No need to join the ambassor tour or any other tours within the park. The map is simple and the park is not that big to walk through. No need to eat lunch at the buffet restaurant too because it is the same as the dinner. Enter the dinner early to ensure you get the flower laie.
The park is free entry. You basically pay for the drive and the tour guide only. The rainforest is actually just a park. You won't go to the valley but only looking at it from afar. The hiking is just a walk in the park.
The advestisement of this tour includes a visit to the macademia nut and honey farm but you will be told the farm no longer work with the tour company so it won't be visited. This tour is the same as the Big Island Grand Circle Tour but more expensive. The only difference is you will visit the same creator again in the evening to see the glow. Although advertised seeing the molten lava turning into rock; again the guide won't bring you to the spot. I heard friends joining other local tours did actually visit the spot but not with this tour. Very disappointed.