Most of the road isn't treacherous, just the last leg.
Alfred (God bless him) drove us, and we couldn't imagine how he'd get his van up the road.
Never doubt Alfred's driving, still the last leg was a jeep path.
We got there early (as a general birder IMHO early is best).
Plus if you're first you'll have the place to yourself.
Besides the Dr. Birds (JA's national bird) there were JA doves, JA orioles, bananaquits etc.
There were copious birds, we even saw a large iguana.
The sanctuary is on a mountain top, surrounded by jungle foliage.
I remember begonias growing to giant proportions, I assumed this may be because this is their native habitat.
We had the place to ourselves for the best part of an hour then another couple came, but we didn't leave until a tour bus arrived.
The experience was unique in the true sense of the word.
Here is an extended version of my take on the Rockland's Bird sanctuary (go to page 15) scroll until you come to the hummingbird pictures:
http://negril.com/forum/showthread.php/2632-Rum-polephoreskin-s-Existential-Wanderings-in-and-Around-Negril-%282012%29/page15?highlight=Rum-polephoreskin