Are there any beaches in or near Batangas where I can take my wife and kid without a membership, reservation, etc.? We are simply looking for a day trip.

Canyon cove is a good option. There's a nice swimming pool and beach and different activities offered. I'm sure the kids will love it!

Try searching the net for Laiya San Juan Batangas they have may day tour beaches like white cove, kabayan, la luz, aquatico..