I'm trying to find a book (or series?) I vaguely remember reading in a school library, somewhere between 1995 and 1998. Its target audience would have been about 8-14 year old boys.
It was a stereotypical fantasy story for kids, about a boy who I think got teleported to a fantasy world from our world. I think he gets a magic sword and goes on a typical 'epic journey' around the place to beat the bad guy. There was a girl (princess(?)) involved and they are on a boat or raft together at some point.
This boat/raft may have been on the cover, as I remember a picture of it. It had a single sail and was small.