Costa Rica Adventure: Thermal pools, whitewater tubing and rappelling

My husband Gustavo slathers a thick layer of volcanic mud over my forearms and across my face with a paintbrush. With my upper body as his canvas, he daubs the ash-colored ooze like an artist decorating his muse. Of course, he is fully aware that soon I'll be the one dabbling in the muck and he, too, will be relegated to a muddy fresco.