Planning a vacation of about 16 travel days in Turkey for the end of the summer. We want to spend roughly half the time in Istanbul and then in another town/small city easily accessible from Istanbul. The first half in Istanbul would be a "City Trip" spending time seeing cultural events, mosques, historical sites, etc. The second half is the "Beach Trip" where we are a little bit more relaxed. However, while I like swimming and going to the beach, my husband has a skin condition that is aggravated by ocean water, and while he's happy to spend some time relaxing in the sun we're looking at places that have a little more to them than just a nice coastline.
For this reason, I'm thinking of Antalya or Izmir. Antalya seems to have the best beaches and might be a prettier place to visit in its own right, but Izmir seems more interesting historically/culturally, less touristy within the city itself, and it's not horribly far from some nice beaches (though not nearly as close or as nice as those near/in Antalya it would seem). Really would like to stay in an area with an airport close by in order to reduce total travel time.
If one city were much cheaper than the other, that might be an important consideration as well--though I'm willing to do bargain hunting either way.
Thoughts or preferences?