THIS IS A MUST, its like Pinterest porn. From split, it took about 2.5 hours but the drive is very easy and the scenery during the drive is stunning. We took trail C, which covers both the upper and lower lakes. The lower lakes are probably the prettiest of them all. The park estimated that it takes 5-6 hours but we did it (without crowds) in about 3. I would imagine that with crowds, it would take longer only because you would have to wait to get the picture you would want or for others to pass. We packed food to bring with us (and then forgot the cheese).