I don't always wear my hair wavy when I'm on a trip for this very reason! I am an overpacker by nature so I try to limit my beauty/hair stuff. I would pack a full size cleanser (low poo), a smaller bottle of a rinse out, one curl enhancer and one gel. I don't diffuse and I would probably only wear my hair wavy every few days.

Definitely bring some hair accessories like headbands since it will probably be very windy!
Coarse texture, normal-high porosity, normal elasticity (Komaza Care), very weak waves
cleanser: Redken Fresh Curls Shampoo, CJ Daily Fix

rinse out: GVP Conditioning Balm, CJ Repair Me, CJ Smoothing

jellies/creams: CR Curl Maker, KCCC, UFD Curly Magic
gels: CJ CQ, BRHG