Last time we were at the Original Mayfield Falls, they had their gift shop, bar and restaurant operating. But after checking it out, I dont think this is one that Chukka will now be "sprucing up". There are two sides to the Mayfield Falls, I have not been to the other one in decades, but both had been offering the same riverwalk adventure on the same river and falls. The two operations should still be available, one now operated by Chukka Tours.
Here is a "blast from the past from 2000:
http://www.realnegril.com/beingees/nn060801.htm
YS Falls has no connection to Chukka Tours other than the zipline. The same owners have made the other additions since the first time I visited there in the mid 80's and they have been substantial. You can now get food, cold drinks and gifts there. The hand carved steps and natural roots that took you to the top of the falls had no railing back then and every time it rained the steps turned into a muddy mess, impossible to pass. There was no zipline down the entire length of the falls, which is still stunning sight. For those unable to make he climb today, there is now a pool to relax in. In 1985, if you couldnt make the climb, all you could do was walk around and take pictures and hope your driver had cold drinks!
Here is a picture from 1996:
http://www.realnegril.com/beingees/nn050796.htm
And here is one from 2012:
http://negril.com/nt/nt051212.htm