Hello Lars,
Thanx you again for your valuable advises!
Especially for idea of using dive trip to Siquijor as transfer to Siquijor. This will save a lot of time for us.
About Cebu/Manila. Note, that we will fly home not from Manila, but from Bangkok with 2-days stopover in Bangkok. This is why we select direct fly from Cebu to Bangkok.
About sharks and other "big things". Funny, but I think that sharks just afraid me

While I dived several times at Chumphon Pinnacle (near Koh Tao, Thailand) I have almost "warranty" that I will see resident shark, but I meet no one

First time when I see sharks (white tip reef shark) was Sipadan island last year

Ok, I will try to meet whale shark and manta ray next time (Honduras, Utila)
Lars, could I ask for your suggestions about best dive sites for diving during 3 days?
What is your personal "top-10" around Dumaguete/Siauijor?

I think, 1 whole day we must dive at Apo island. What else?