+1 married to a Philippina! As above, the roads are not the safest / best / fastest, to get around far from Manila it's best to fly. However I would strongly recommend a day trip out to Mount Pinatubo (the one which erupted in massive style about 20 years ago); it's about 2.5 hours each way from Manila and then you have to take some hugely fun open "jeeps" and then about an hour's trek to the crater – which is vast and has a lake in it.
Further afield thoroughly recommend Bohol / the Chocolate Hills; Bohol has a very good ecological philosophy to it and is very beautiful (that's a flight though). Everyone talks about Borocay, but my feeling is that it's got a bit too commercial now; there are better places.
The people are wonderful, but as above don't expect anything to happen too quickly / logically, just be patient and it gets there in the end (usually after a lot of eating and singing, the nation's two great pastimes). It is hot and humid, but November is probably getting on for the best time to go, although I understand the weather's been bonkers this year. No-one will have a clue by the way why you would wish to walk / trek anywhere! There are some mtb tracks (all unofficial as far as I know) around Manila.
Good luck!
(Waves to Matty)