I absolutely adore the sailing in Valheim; the reliance on the wind, the lack of protection on a boat, and just the encouragement to take in your surroundings and (not so) subtle clues before sailing. Subconscious questions like: "how fast is the wind?", "what's the wave height further out?", "is it high tide or low tide?", "is it foggy?". Such basic, simple questions that can make a huge difference, whether you're trying to sail to new lands, peacefully sail, or sail along the coast.

But, I do think that the seas could be bigger. I know it's a controversial opinion, but I was somewhat disappointed at the small size of the current ocean. I'm thinking that boat trips should be enormous undertakings, taking several in-game days to even so much as reach new land, and requiring a lot of prep beforehand.

Another thing I think would be neat is ship customization. Customizing a ship for different purposes, like changing the sail rigging for various tasks, selecting different hulls, etc.

For example: a fore-and-aft rig for much greater speed while tacking or on a beam reach. Maybe a sleeker boat hull for minimum water drag, at the cost of flipping over easier in storms. Maybe a shorter, stubbier, canoe-like hull that turns extremely easily, making river navigation a breeze, but can tip over in a little too strong of a breeze if the sail is fully opened; might want to reef the sail if it's starting to get a little wobbly!