I think the time together and the experiences are wonderful. But I wouldn't have strong expectations about kids developing a love of the outdoors from treks organized by parents. I've seen too many examples of parents who love hiking/backpacking, taking the kids along (dragging the kids along is what some kids would say) and then the kid turning totally against anything outdoor related.

But maybe that's a temporary thing, and it comes back. Teenage rejection of parental values, something like that...