A friend of mine wrote about our trip to Devil Island at Apostle Islands:
Carrying everything you need to survive in the wilderness in your kayak, you launch from the mainland. You pass the docks and stroke into the open waters of Lake Superior. It is three miles to the first stop, Sand Island. The sun is shining and the water is cold, clear, and calm—the surface a peacefully glimmering mirror. In just minutes however, this serene scene can morph into merciless waves complete with white caps. Talk to any local who has experience with Mother Superior, she is beautiful but has been known to wreck ships. However, when you connect with this power, prepare for anything, and decide you will learn to paddle across open miles of freshwater inland sea, you may discover a whole new side of the world, and yourself.
The Apostle Islands National Lakeshore is formed of ancient sandstone bedrock that was subject to glaciations and varying lake levels. Over centuries of freezing, thawing, and constant wave action, the soft sandstone was carved into the formations we see today. The most striking of these are the sea caves—from shallow shelters to deep, cavernous rooms. When the waves allow for kayaking inside the formations of Devil’s Island, you will embark on an expedition to the past. There is nothing quite like the drippy thunder of the Lake’s waves resounding in ancient sandstone sea caves. There are also various types of windows, arches, and cliff face formations around each corner of many of the islands.