Wow sounds like you have a great trip planned... Again as far as safety goes, I have traveled solo throughout the Philippines to meet up with groups and have yet to have any problems.... I would just take care to pack plenty of rechargable batteries as the batteries here are relatively expensive and sometimes quality is suspect...
If you carry an unusal/unique computer I would bring an extra battery for that... But if your experienced you already knew that
....
Finally you can pick up a copy of the latest lonely planet guide and you should be all set in case you want to take any side trips....