Don't contact online too early
I think a lot of guys must start chatting online with girls much too early before they come to the Philippines.
I have had several girls in the past week express surprise (and then delight) to know that I am ACTUALLY in Manila right now.
Upon further discussion, these girls all said that most guys online all talk about meeting them some vague time "in the future" and that rarely happens, so the girls get really disillusioned about all the hollow and fake promises that they are given.
My advice would be for guys to be really low key in initial chats. If you have a definite date for your visit then tell them when (no need to be too exact. Like early in May or last week in June is OK) and they will be OK. Even better advice is to contact them a day or so before leaving home with an "I'll be there next week" line. Even better still, wait until you're in your hotel room and then hit up your random targets with a "I am here in Makati / Malate / Pasay / Davao / Cebu now and I wonder if we could meet".
Chances are they will drop everything and meet you within the hour (or two!