Tuolumne Meadows was the first ever inductee into the International Meadow Hall of Fame.1 It's ringed by picturesque peaks, bisected by a meandering river, lousy with wildflowers and grazing deer, and dotted with curiosities like a soda springs and the world's most scenic sewage treatment pond. It's at an elevation of a little over 8,000 feet (2,400 meters), so your lungs will get a pleasant workout just by being there. There's a little shop across the road selling ice cream. You just can't go wrong with Tuolumne Meadows.
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1 Of course it exists! I should know; I invented it myself.