On our second full full day in Iceland we piled into a coach bus and did a tour around the "Golden Circle." This is a total tourist-y thing to due but it's still quite spectacular and a great way to spend a (still jet lagged) day.
We visited A Þingvellir, B Gullfoss and the valley of B Haukadalur. We also visited ... a greenhouse, which I suppose is a bit novel to Icelanders given their history.