Surigao is the one place I have never been to in Mindanao (what a shame). Maybe one day I will visit the place with my fiance(husband by then). It is I think the Surfing Capital of the Philippines. Siargao too is a lovely place to go and see. I am from South Cotabato where Dole Philippines is located...sadly, it isn't so safe for foriegners to visit my hometown and it makes me sad reading the travel advisories on the net. But anyway, I love Mindanao and am proud I grew up there.