Originally posted by Severian:

If you build a small ramp at the place where you left your boat, you can also drag/push the cart onto your boat for massive additional cargo space.
Just remember to stick close to the coast, and don't sail in storms, because if your stuff sinks, it's gone for good!

you can also do this with wolves, just hope you don't run into a serpent in the middle of the ocean.... sometimes i wonder if they are still swimming around out there hahaha

but yes, carts! i think i have like 25 lying around my base. i like to leave one at any entrance for easy emptying of inventory, once it starts to fill up i transfer over to my warehouse chests.