Black Don,
I have had the unfortnate luck of visiting Gumbet over a dozen times, due to my mother living there a number of years ago. Now lives in Istanbul, where theres even less water.....
Anyways,
Fishing.... If you take a Dolmush (Turkish Minibus), to Bodrum, about 5mins drive away, and get dropped off at the Marina.
You can either fish of the Marina moorings, or the long wooden jettys, in and around the boats. This is where I had my largest fish, around 7lb!
Head towards the marina 'breaker wall', this is where the locals do 99% of their fishing from, and myself included.
I took a 11ft 4 Piece Carp Rod, and fished for Mullet, with Floating Breadflake.
However, there were some Locals who were spining for them and having plenty of success.
The marina is well signposted, in english, so you'll be able to find your wy round pretty easily.
Other than that, head for the Red/White Tower, near the breaker wall, and theres plenty of mullet there.
Hope this helps,
GC