The unicorn didn't put up much of a fight. Once it was dead, I didn't find any treasure, but its single horn was very valuable as an alchemical reagent.
(Evil +10, Alchemy +20)
We arrived at the shores of the Silver Sea, finding the location marked on the map. The X seemed to indicate an area just a few hundred meters offshore of a small town called Opal's Cove.
The only boat I could find was owned by a man who charged a ridiculous fee. He knew I was stuck, so he took advantage of the situation. I had no choice, so I paid the man, and he rowed us out until we were floating over the approximate location.
(Gold -345)
It just looked like a lot of water to me. I knew I needed a way to go underneath the waves and find the shipwreck.