Our 3 adult children will join us for week's vacation to Costa Rica in 2013. We need recommendations on the best/cheapest time to travel and on an itinerary that will ensure we see/experience as much as possible of the country in the short time we have. We would need 2 rooms - 1 for 2 and 1 for 3 of us. We probably wouldn't mind driving ourselves around. We're interested in hiking Arenal Volcano, experiencing some hot springs and a canopy tour, spending some time on the coast and taking surf lessons for a day, touring a rainforest, viewing wildlife and triopical habitat, possibly taking in the La Paz Waterfall Gardnes, and whitewater rafting. Any suggestions on an itinerary that could work all these things in at an affordable cost?