This place is so nice but in desperate need of money.
They have a beautiful, long nature trail. And a tour on a small trolley (max 7 people) is included in the somewhat high admission ($12.50 per adult). They also house the Wild Bird Center which is financed by donations only. So it doesn't look as nice as in a Zoo, but their main goal also is to help the birds. The museum seems to be renovated at the moment, but looks very nice too.
Places like this need to be preserved, so go and spend half a day there and leave some money.