I would advise sitting from morning till night under some willow bush on the river bank where there is a wide view. This will be "doing the valley" far more effectively than riding along trails in constant motion from point to point. The entire valley is made up of "points of interest."
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Source, in full
"The Summer Flood of Tourists", San Francisco Daily Evening Bulletin (part 1 of the 11 part series "Summering in the Sierra") dated 14 June 1875, published 22 June 1875; reprinted in John Muir: Summering in the Sierra, edited by Robert Engberg (University of Wisconsin Press, 1984) page 71
Notes from Wikiquote
(Advice for visitors to Yosemite given by John Muir at age 37 years. Compare advice given by the 74-year-old Muir below.)