Day-trip sailing / gulet in Izmir area

Dear InterNations fellows!

I'll be in the Izmir area (Izmir, Çesme, Kusadasi) in late August and would like to do a sailing day trip. Is any specific port best for this (nearby sights)? I'm most interested in pleasant sailing and vistas (beaches, islands). If available in the area, scuba diving would be a big plus.

Suggestions most appreciated!

Marcelo