I find it to be too expensive to rent a car for a few days when I mostly just want to get to someplace and chill out. I don't like to look out the window of where I am staying and look at a car racking up money while it is just sitting there.
What I sometimes do is figure the furthest I want to go (in your case, Treasure Beach) and arrange a private ride with a Route Taxi Driver who is going there anyways. You can go into a car park in say Negril and find a driver who will take you to Sav for a flat fee (sometimes I offer a driver 10 fares to take me and my crew). That might be about $1300 Jamaican but still only about $10 US and then so on to Black River and finally to Treasure Beach. And then work my way back to Bluefields, Belmont, etc.
Driving a rental car is not a bad option if you can adapt to to the Jamaican rules of the road.
Not everyone travels the same way. As my friend Marshall says, "My way is not the best way, it's just another way"
Peace and Guidance
