Iceland is absolutely worth the trip. Spectacular in every dimension. Disappointingly for me the Jokulsarlon visit was at a time that was not prime for viewing. One cannot predict such things as ice flow, calving, tides, sunlight, wind, and so on. Everything else on the trip was beyond expectation.
An outsider delight with climbing, ice cave exploration, hiking, aurorae (not in summer), fishing, walking from North America to Europe (volcanic separation zone of the two plates). Oh, lordy I could go on. If I had visited when I was 25 I might never have returned.
Sounds pretty awesome. Maybe one of our next trips. We were on a cruise in Alaska a couple years ago and it felt like being on a different planet. Absolutely stunning.