Waterfalls and vulcanism, thats the clichee of Iceland. The huge lavflow in the north was declared finished during my visit and therefore the question did not rise, whether to hire a plane or not. It was definitly to late.
Vulcanos during winter are snow capped mountains and the colored rocks are covered with snow. This makes them less attractive. Geothermal fields however are even better during winter. The cold air creates more steam, the colors are fresh and sometimes you have ice and boiling mud in one picture!
Most of the waterfall have been much better than last year, more ice, still plenty of water and sometimes even sunny weather, of course windy! Taking pictures of waterfalls in winter is an icy business not only for the photographer but also for the equipment. The spray freezes immedeatly to tripod, camera body and of course to the lens including the glass surfaces. Cleaning iced over front lenses or filters is nearly impossible. Very challenging. Sometimes it helps to use long lenses and shades, but some pictures are only possible with wide angles. All the same frozen waterfalls are a beautifull sight and not to be missed!