To add a bit more life to the game I recently used mods to add more land animals as well as sea creatures and birds. I've killed bears, moose, sharks, swans, capybara and so on, so it's nice to have the impression the world is more alive as well as extra food. I haven't been out at sea on my current map yet, having killed the sharks in the shallows, but I hope the seas are nicely populated too. :) If you're interested in more wildlife to hunt, do a search for "animals" on https://valheim.thunderstore.io/package/ which also turns up a mod for farmyard animals, too.