I telephoned them for an answer. They have no inside botanical garden in North Tonawanda like the larger cities do. They grow things indoors to place outdoors. They do not accept any indoor plants. Since the peace lily is an indoor plant, they suggest perhaps donating it to the senior center or anywhere else that you desire. The botanical gardens of North Tonawanda can be reached through the Parks and recreation department.
There must be someone to contact who manages that park? I'd start with the city clerk, they may point you in the right direction.
Thanks! Your answer is awaiting moderation.