You should probably direct this question to the keepers of the preserve itself. They can be contacted through the Georges River Land Trust. (Right now you are asking a community of local Google users) That said, they do facilitate art camps in the summer for kids. I'm sure that something can be arranged for your group if you reach the right people.
Pretty certain that the answer is yes. Id direct my questions to Tobin Malone , executive director at their Rockland offices. 594 5166. Tell them Laura Cabot Catering sent you. Maybe you'll need lunch delivered! 832 6337
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