To my surprise and enjoyment, the Annual Boo at the Zoo event at the Philadelphia Zoo, wasn’t a complete wash out. Actually, it was probably the most fun we’ve had at the event since we have been going. They were prepared for the rain and had trick-or-treating at all the indoor spots. They had the “Treehouse” (indoor play place) set up with pumpkin painting, mask making and lots of burn- off- your- sugar- high fun for the kids. Anyway, we had a blast. My husband even had a great time (though he won’t admit it).