Yes, it is a beautiful place, but there are ways you can enjoy it more. Avoid tourists by going early or late. Between 8-10, and 3-6 the place is beautiful. Try to go on a weekday, less crowded. Officially, the park closes at 6, but it doesn't get dark until 9 or so, and there are no gates (or you can walk past them easily, so I would try going late if I can do it over again). I think just the bus stops running at 6.
Ideally, stay at the hotels within the park (but these get booked way in advance). If you can get to station 3 (upper lakes) in the morning, there are no a lot of people.
Try to get a good map, the so called map the park gives you is worthless. Even the map our hotel gave us was terrible. Try to look for a map in a shop maybe? You can't get lost in the park (there are only a limited number of trails in the park and it gets packed with people on them), but you may end up on the wrong side of the lake if you intended if you don't have a good map like we did several times.
Also, decide what you like and spend the least crowded times in those places.... Ie if you like small and plentiful waterfalls (mostly upper lakes), beautiful water colors (lower lakes), or one large waterfall (side path in the lower Lakes)
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