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Insane amount near glaciers and inland overall too.

I suppose so... At first I had plans to take F26 and cross the island on it, but after reading carefully about what that "F" means, and the rivers that appear in the afternoon and become very deep I changed the plan for good :D
Have you taken any of those F roads?

Unfortunately no, I havent rented a 4wd car. Its in my future plans to do a full inland trip.

Actually, we rented a Toyota RAV4 that is 4wd but it wasn't good enough to cross rivers...
I remember, though, seeing a couple of those huge, military-styles trucks with tires bigger than our whole SUV :D