Belek is an upcoming area, it's ideal for the golfer.
Belek and it's neighbour Kadriye are quiet resorts, shops, restaurants aplenty but at this moment no decent pubs. There was a disco bar getting built in Belek, should be finished soon.
It has all the facilities you would expect in a resort ie paintballing, horseriding jet ski's etc.
The beach & towns are never packed they may be busy but not like Side,The town square in Belek has regular free shows on during the summer months.
I am not familiar with Kemer