Andi, welcome here on this forum.
As you still have all the time until your stay here, you better read the many threads on this forum. You can also select via the search function.
If your stay only a few days you won't be able to see a lot of the environment.
Around Thalatta (my neighbour):
-Malatapay market on each Wednesday
-Lake Balanan (near Siaton)
-Tambobo bay
-Apo Island (also for non divers)
-Dumaguete (at 25 km, whatever you want: from boulevard, bars, restaurants till cockpit fight
and disco)