Hm, this is a good question. My first thought would be the paragliding, but that doesn't exactly help you get up. And there will probably be some islands that are too high up to really access with the gloop-through-floors-ability. Perhaps there will be some form of air gusts as I believe was implied by the geo thermal springs. If that proves limiting, then maybe a newer form of Revali's gale that can be used mid glide? It's fairly difficult to say at this point what features and abilities Ninty is putting into this.