I don't understand the Route Taxi fascination although I sometimes take them.
For two people; it's now going to cost several hundred dollars (maybe 500 with a small tip to get from the beach to the cliffs-two rides).
I have never had to pay more than 5 or 6 dollars U.S. for a daytime charter from the beach to the Seastar Lane, plus a tip of course.
Charters are private rides. You're not picking up other passengers and holding a student on your lap during school times.
Taxis in Negril are a total bargain compared to what you would pay in North America.
In my hometown a ride from say Margaritaville to Seastar Lane would cost close to 20 dollars.