Simply put, Isle of the Unknown offers a wealth of ideas suitable to drop into any fantasy campaign. The isle can be used as such, but creative GMs can also use this resource to pepper their existing world with various encounters, rumors, and adventure location incentives.
The isle is divided and numbered by hex, with various encounter descriptions described with just enough detail. The creatures have a non-typical twist to them, giving the isle as a whole, a weird-fantasy vibe- not too dark and not too whimsical.
A very pleseant product overall. I highly recommend it.
[4 of 5 Stars!]