6. Explore the Underwater Shipwrecks
There are plenty of interesting areas to visit across the lands of Tamriel, but there are also areas hidden underwater that are well worth investigating. One notable location is Pilgrim's Trench, found by following the coast west from the College of Winterhold then heading offshore across the ice sheets towards the ship icon.
Unless your adventurer is an Argonian, you'll need to stock up on waterbreathing potions before diving down to explore the sunken wreckage without drowning. In the middle of the three ships you'll find a number of chests to raid, plus the whole area is rife with salmon so you can also net a fishy haul.