Expediciones Palenque (787/823-4354 or 787/306-4382, info [at] expedicionespalenque [dot] com, www.expedicionespalenque.com [1]) offers daylong spelunking tours to Yuyu Cave for novices, as well as a wall-climbing excursion and base-jumping adventure from Puente Mata Plátano José Jiménez bridge.
Links:
[1] http://www.expedicionespalenque.com