If your into camping/swimming/relaxing. Try Anawangin Cove, Zambales. Its a 3-4 hours drive from Manila. You can stay overnight or day trip.
No accommodation, no electricity, no signal.... You have to bring your own tent and food (pwede magluto dun, but bring your own stove or uling na lang). The place is worth it at mas mapapamura kayo kung marami lalo na sa boat.
Been there last fri-sat, we did a 5-6 hours hike through Mt. Pundaquit going down to "the Anawangin Cove". The place was unbelievable. You have to see it to believe it.
If you don't want to go for a hike, opt for the 30 mins banca ride from Brgy. Pundaquit to Anawangin... for additional infos.... just reply here....