I transferred at Manila for 6 hours before leaving. I went to Manila Bay only but it's disappointed totally. There is many beggars & homeless people. Water is so dirty & smells badly. Don't waste your time to go there. Transportation is chaos & traffic jam everywhere. There is no map & public transportation around airport.
Insider Tip:Take a taxi with meters is opened. Taxi driver is scam. Avoid late flight because of traffic jam, calculate your travel time carefully. Anyway, you should have one Filipino person go with you. Shouldn't go alone without intention.