Recently there was long thread about the BCA. I can now post possible answers to some of the questions, such as "Why is the BCA still raising membership prices when there is a significant amount still left in its coffers?"
Agreed, spectacular. There is a nice ice cave in the Myvatn area that is now used for tourist caving and of course there is Grotaja, a thermal spring cave, which was fun to swim in although access restricted now as got too popular due to Game of Thrones.