This seems to be a swamp, you'll probably want to come in the winter. I went into my shin in the muck even in sub-freezing temps. Parking is all around, I parked on Fenway. If you enter by my other cache, Phone a Friend, you will be crossing public land into this swamp. BYOP.
Please note - this cache is in a potentially dangerous location and seeking it is done at your own risk! There is no such thing as safe ice in the winter.