Me and my husband have been talking about going out on a out-of-town trip along with our baby boy, any suggestions where we should go first?

Since you mentioned your boy is still a baby, you might want to consider Manila's adjacent provinces that doesn't require a really long drive. You may check this list for options :) http://www.thepoortraveler.net/2013/03/15-great-destinations-near-manila-philippines/