If you're up for a road trip with the kids or just want some relaxing nature ambience on a weekend, I'm pretty sure you'll love it at PACEM.
PACEM is a short acronym for Peace And Care For Earth Ministry and is an eco-park within Assumption College at Antipolo. You don't really hear it being recommended by people because Picnic Grove is always top of mind for these kinds of destinations. I'm the type who likes going to quiet places so this was perfect for me.
My friend Mailan and I went here last February (I know, backlog extraordinaire!) and we really loved the place. For Php50, you can enter the eco park and access all displays and sections. They were open until 12NN that Saturday but I hope they extend their business hours every Saturday so more people can go there on the weekend. :)
Going around was just like having a stroll at the (safe) woods and I loved the chirping birds and crickets while we were roaming around (and taking photos for Instagram).
There were also showcases of animals within the park and a butterfly garden where you can enter. The philippine monkey and owl eagle were my favorites!