Thanks everyone. Using a credit card is no problem, I was just concerned if buses/taxis would take them, but it sounds like they will. We are doing a 6 hour tour that starts early and ends mid afternoon, so we are all set for an excursion. We'll be Reykjavik overnight, so I think we are going to explore the city a bit and maybe try an Icelandic restaurant. I've never been to the port so I was not sure how easy it is to get transportation back and forth. It sounds like there are plenty of options between taxis and buses, so that's great! Again, any other tips/tricks/things not to miss are appreciated.🙂