We packed a lunch and ate by the bald Eagle exhibit.
Yes walk in coolers are allowed
Yes
Yes, you can.
We took snacks in with us in our stroller but to sit down for a picnic I'm not sure. Your visit there will only be for about 1 1/2 - 2 hrs
There were tons of parents with snacks for kids there is call and ask theybdo habe concessions
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