Hi there and welcome to the forum.
NUMBER 1 AND ONLY TIP
be yourself.... do not TRY to impress.
if your anything like most filipinas I know you will blow them away with your smile, natuiral warmth, humility and dignity. You are probably less shy than some, well travelled and your written English is great so I suspect youa re well educated as well.
As I say just be yourself, a nice Filipino gift would be a good gesture, not expensive but truly filipino.
good luck