If you are anywhere close, this is a Must- Do activity; it is simply spectacular. Other reviews provide the history of the volcano that collapsed 1.7 million years ago which created this beautiful and scenic lake. Plan on spending at least 3-hours driving around the entire lake. The Rangers do a great job of managing the surrounding areas and there are many available activities, including the trolley, boat rides, cycling, camping and incredible hiking. Great fun for the entire family!