I want to start off by saying that Iceland was awesome, and one day is not anywhere near enough time to spend there. But, alas, one day is all we had, and we filled it with a photography tour of the area. This is one of the neatest tours I've been on, as the leader is an experience photographer and had a great eye for when to stop. We also had multiple times to check out rainbows and play with that. I am likely going overboard with photos on this post, but it was really quite fantastic.
We did also happen to find three caches on this day. It was nice that we would be enjoying the scenery and taking photos, then one of us would open the app and have a cache very nearby.