Forgot to add as well John, while you're at Myvatn.. if you're at that hotel I mentioned you'll see an amazing crater in the distance.. called Hverfjall.. it's around 600ft high from the surrounding area to the highest point around the crater rim, and it's maybe a 5 mile hike from the hotel.. I just decided to go for it one day and it's well worth the walk.. the views from the top are spectacular across the lake and surrounding area.. and the inside of the crater is wicked - it's full of grafitti made of boulders and stones!
My keyboard's running out of ink....