Things to do while waiting for boarding: Catch a few NBA games, shop for gifts/pasalubongs at Duty Free and the many other shops, buy medicines or other travel needs, surf at the Free Internet Station, get a prepaid SIM or roaming load for your mobile, make all the texts & calls (There are pay phone booths as well) you need to make BEFORE going on roaming( It's cheaper that way), set your SIM/mobile on roaming, get a massage, simply lounge around or eat. The last is my fave to do ;) My usual food stop at NAIA 1 is Great Panda. Love their shrimp siomai! ;) They've got congee, noodles, siopao, etc. Yum!
If you're a Mom with an infant in tow, there's also a Feeding Station for you and your little baby.
Before you do all that, set your cellphone alarm to make sure you won't miss your boarding call. Oops, there goes my alarm!
Safe travels! ;)