Visiting!

[river_meimei]

Serenity's cargo bay is huge, at least compared to the rest of the ship. There are other ships with far bigger holds, of course. But still, it's big enough to hold a crowd, or multiple vehicles; there's a hovermule, in fact, suspended from chains near the ceiling. There are stairs, too, with metal mesh and wire railings, leading to catwalks.

River's door was apparently a small niche in the wall, usually covered by an oddly-shaped bit of paneling that's now leaning against a nearby crate. She has to crouch a little to get through from Milliways into the main bay.

Stitch doesn't.