We parked in the Visitor Centre which was on the 395 just north of Lee Vining. There is an easy 2 km long trail down to the lake and the amazing tufa formations. There was no fee to pay, however if you drive a little further north on the 395 and park in the car park nearer to the lake there's a $3 charge.
We spent 3 hours just wandering about. The scenery is really unusual and I can highly recommend this place to visit.
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