- Extra battery or two depending on how much you shoot and availability of electricity
- Good camera bag with rain cover
- Gray balance card or ColorChecker Passport if you wanna get fancy
- Good camera strap
- Good tripod bag/strap
- Lens hood for at least the wide angle zoom
- Flash might be useful
- Extra memory cards
- and perhaps most importantly, backup-capable portable HDD with card reader (Hyperdrive etc.), or a laptop with a card reader. You really don't want to travel with all your precious photos in one place, with no backup.