Bergmenn Mountain Guides
(http://www.bergmenn.com/). iceland's only certified mountain guides, offering guided ascents within vatnajokull national park.
January-March, find a guide to ski Hvannadalshnúkur.
Hike up the hill and see all the waterfalls and great views.
Glacier Guides
(http://glacierguides.is/). offers tours, ice walks and ice climbing around skaftafell