You can choose from several different paths around the lakes ranging in both time and difficulty. A complete run through the park can be done on trail H in 4-5 hours (3.5 if you really hustle), but you'll want to take your time and enjoy it. The views are simply spectacular. Some trails have boat transfers and bus transfers (free of charge) to save you time walking. Make sure you hold onto your entrance ticket because they stamp it at the boat interchanges.