I would take the flash for night snap shots, backlit shots that can use fill flash, etc. Lots of use beside the inside of places.
Also take a small laptop or a dedicated SD card backup. Has much more storage (unless you're purchasing huge SD cards) so when the cards fill up you can back up to it and keep using them.
If you bring flash, bring (or buy there and keep in backpack) extra AA batteries for the flash.
I bring my tripod everywhere, but for lighter traveling one might consider a monopod that is compact to store.
And, bacon jerky...