We're planning on going to CR next week for 10 days. Landing in San Jose, then going to Arenal, Monte Verde, Cahuita, and back to San Jose. The question is, should we rent a car or use local buses and shuttles? I drive a 4WD truck here in the US, but almost never actually use the 4WD, and we're a bit concerned about driving in the rainy season there. Anyone have advice about which alternative they would choose?