We went to this park in mid June 2013. It was amazing day trip. I entered to park from Three River entrance. If you only have one day, you need to see Morrow rock, Crescent meadow, General Sherman tree and Crystal cave. These are key attractions of the Sequoia national park. Best thing go early as possible you can. First, see the Crystal cave. Cave tour need at least 3 hours. Then go to the Giant sequoia museum and park your vehicle there. From that point, you can take the free shuttle. Take a free shuttle to Morrow rock. When you come back from the morrow rock, next shuttle stop is crescent meadow. You must walk through trials and enjoy the nature. Then take a shuttle go to see the world largest tree General Sherman. If you have more time explore further. I will go again very soon to cover the kings canyon park
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