I am going to the Philippines to meet someone and because of the limited interval between receiving the money to buy the ticket and trying to arrive at least a few days before Valentine's Day, I am not going to have enough time to obtain a tourist visa beforehand. I want to be in the Philippines for 2 - 3 months.

Can I just purchase my ticket for a trip of more than 30 days, then get my tourist visa when I arrive in the Philippines?

Edit: I am a native born USA citizen leaving Florida. The time I will be receiving the money is between February 2nd and 8th. I have never traveled and don't have any visa.