What is the local currency?
The Philippine Peso (PHP) is the local currency.
Should I change money before I go?
Yes, but not necessarily. You can exchange money in foreign exchange counters in the airport upon arrival. The rates are surprisingly better in the airports than in the city.
How much should I budget per day for extras?
Set aside at least USD 40-60 but take note that this also depends on your consumption of food and alcohol during your holiday.
Is it customary to tip?
Tipping is not required but it would be fully appreciated. Your Pack Leader can organise a tips kitty for your convenience. Tipping at restaurants is common and around 10% is the normal going rate.
Then for your guide and driver, it is customary, though not compulsory to tip them around £5 a day, this would normally be given at the end of the adventure and is completely up to you and whether you feel they have earned it or not.