Valkerian Explortion is a modpack all about exploring, with a revamped nether, end and overworld, as well a the Twilight Forest. There is not currently a questline, nor any official guides on how to play or what to do. The major facet of this modpack is to explore. Going along for the flight is mods like Farmer's Delight, Comforts, and Quark. There are many new structures, mobs, and blocks, most of witch work on the actual airship/boat. (Some major notes of things that are buggy: Long distance waystones, sleeping rolls, and sometimes ladders when at a 45 degree angle to the world grid.)
This modpack is inspired by an AsianHalfSquat video, and takes many details from the idea he describes. As such, I would like it if you check him out! (he is not me) He does mostly mod reviews or modpack ideas, and is a fun watch when bored or doing research on a mod/modpack. Heres a link: https://www.youtube.com/watch?v=SvoQvg8kmzQ