This warm abode of Erdek is a delightful place to visit in Turkey. The nearest major city to Erdek is Istanbul. Take a short trip from Erdek and set some time aside to explore the Istanbul. Dotted with places like Sultan Ahmed Mosque, Topkapi Palace, Hagia Sophia; it will definitely be a good idea. 1-2 days is an ideal duration of visit to Erdek.
Yes,it is that simple really! Enjoy your trip! Keep travelling!