Hi Gillian
I too enjoyed many a football match down the 'Naitchie', and have more recently been through on a mountain bike, it has indeed, in my opinion, been neglected by the local authority to the point where it has been allowed to return to it's natural state..!!
I am afraid that I can't quite remember the house or any statue.
I guess the old railway line (which is now a footpath) was there to support the mining industry.
Anyway best of luck getting the council to take on the Nature trail, but I fear that in the current financial climate it may be well down the list, and your best bet may well be any conditions included in the bequeathment of the land.
If you have a knight of the realm on board that may help....

Alan Knightshift worker as opposed to Knight...!!
ps I don't think the Watson fountain was a memorial, understood it was a gift to the people of Hamilton by Sir John Watson
see
http://www.britishlistedbuildings.co.uk/sc-34512-cadzow-street-muir-street-watson-fountain