I'm almost certain that Garden of Sun lay on transport to take you into Altinkum. On one side of this hotel there is a beach(not that brilliant) which is next to the new marina. Going towards Altinkum seafront you've got a funfair, this is under re-construction as I speak. Beyond the funfair you drop down a slope to where the boat trips operate from. Beyond this is where the better beach starts and also various bars and restaurants, most of which lay on some form of entertainment, especially Temmuz and Pinnochios(located about 2/3s of the way along this stretch).
For culture vultures there is the Temple of Apollo which sits at the top of Altinkum, a dolmus ride away. Beyond this is Mavisehire where there is a water park and also a market every evening from 5pm(best to get there about 6pm !!). The weekly market in Altinkum is held on saturday and most dolmus go there. For retail therapy, Love Tours do a shopping trip to a retail park(Kipa(Tesco) and IKEA are here) at Izmir for £10 a head(other excursions are also available through these people). Hope this helps you a little more.
Les