As for the 4x4s, they are not that bad, but you have to use your own judgement--it's a very "hands-on" trip, periods of jostling where you have to work to hang on. But it's slow-mo, not break-neck speed.

And since you're sitting sideways in the back of a jeep, motion sickness is another issue--if I go on one of these again, I will definitely pop a bonamine pill first.

The 4x4 portion of the river trip on Raiatea was quite tame, as I remember. The one on Bora Bora was the worst, jostling-wise.

Wendy
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Booked: Uniworld Egypt, 2015
Tauck Amsterdam to Budapest, 2016
Paul Gauguin, Societies & Tuamotus 2016