We went to the Philadelphia zoo a six years ago. It was very nice. There are lots of Kosher places to eat in Philly and in Cherry Hill,New Jersey. Also, the New Jersey Aquarium is in Camden right across the river. It’s a nice indoor aquarium, that is perfect for small children. They have a Hippo Exhibit, shark tunnel and a really huge tank with fish. My husband and I went there, when he had a business appointment in Philly. We had some time before the appointment so we decided to visit the Aquarium. We liked it very much. Keep in mind that Weekends are very crowded where ever you go. Also, some places are pricey. Find out about them before you go. It would pay to have your husband take off a day or 2 to really get the most out of your visit.
We also went to Boston, about 5 years ago. It’s a 4 hour drive. The New England Aquarium was very nice. There are also lots of ferry boats. Also, lots of kosher places to eat and you can find a Minyan for your husband to pray at.