Any of the drivers listed on this site will take you on a solo day trip, or maybe have you tag along with one that is already scheduled with another group. Last year I did Mayfield Falls: lovely one hour drive up into the hills, medium difficulty hike and easy climb through various waterfalls. This year I did an afternoon at Zimbali (find it on Tripadvisor, they will pick you up): about an hour drive, low difficulty hike through a very well maintained organic farm growing everything under the sun, followed by a lively cooking demonstration with lunch and some chill time before departure. The nice thing about Zimbali is that you will not be alone since this is very popular and there were a few solos with us that day too. Other than the Zimbali day trip, we use Kingsley James ("Kingsley Take Care Tours" on this site under Transportation tab) for RT airport transportation and excursions, and pay the quoted price in cash plus tip at the end of the drive. Next year I would like to try Floyd's but I really love getting into the lush Jamaican jungle too.