Originally Posted by
kokonutz
Probably won't rent a vehicle because we intend to spend most of our time walking around Fira, enjoying the view and, uh, doing honeymoon stuff before we head to Crete on the fast ferry.
IIWY, I'd take my driver's license along in case I changed my mind. Fira is a fine place to hang out and enjoy sunsets and what have you, but it's quite small. Renting a car is a fun way to get around the rest of the island in less than a day - see some funky volcanic beaches, wineries and stuff. Taking a boat trip around the caldera can also be fun, but you're stuck with a bunch of other people, which might not be what you want on your honeymoon.
Have fun.