I checked details about Kartepe, I was not aware of this place but I googled it and its nice place. Lot of things k like grear snowing and skiing, hiking, paragliding,etc )you can do there. Seems to be nice location to setup a hotel their.
That will be pretty good stuff, not just a vacation of swimming things or resting but you can choose different types of activities, like what you said. As an individual who are stressed in daily life, it's a nice thing to spend some time there.