What did we enjoy? The variety of beauty, animals, weather (40 degrees, light rain and much fog near the top of our trip) and particularly our great guide Aaron. This young guy is genuinely enthusiastic, makes sure to include everyone, knows a ton about not just the park's landscape and animals, but about restaurants in all Colorado cities, etc. While surely the other driver-guides are fine, ask for Aaron, just in case. We may sound like friends of his going in, but we're an older couple visiting from Costa Rica.