A picture is emerging. Take a look at the following Google clickable map that I have been making. This is being added to and improved constantly.
This region is greatly influenced by the winds and currents coming uninterrupted from the Pacific. Coast lines may be that much cleaner, as a result...
Anyway, the grand picture seen by me at the moment is this.
There is a clear corridor of journey for foreign visitors, west of Surigao. We could use part of this corridor to get to Surigao, clockwise or anti-clockwise.
Alternatively, you could make it into a complete set of articulated trips and be happy with it. If I haphazard a guess Surigao is a very large town and is probably worth spending a day or two there for civilised eateries.
That apart, we see blocks of areas of interest, potentially 3 blocks of them. B1 is Surigao centred. B2 is Siargao centred. B3 is something more off the beaten tracks, perhaps and more interesting about B3 is the fact that although it is part of Surigao del Sur it is already reachable form Davao (or Tagum).
Zamboanga down to General Santos line is now too dangerous, due to Islamic extremists being rampant there. Manila-Davao air route should be OK unless you walk into downtown Davao near the river and People's Park area there and instead go straight from Davao International Airport to regions.
These are the basis upon which I contemplate on my next fishing trips in the Philippines almost everyday I am bathing in the infinity onsen pool at my gym.
I am mindful of the knowledge that the bays north of Mindanao are rich in yellow fins and other tuna spices. Perhaps, I should go for it? In January 2017?, before my planned Taiwan (south) visit in February and my March visit in Palawan north?
It all remains to be seen...