We have a bunch of these on our website, backpackthesierra.com. you don't say how many miles you want to walk, or if cross country is an option...and as always at this crime of year, pay VERY close attention to the weather.
Look at Ten Lakes Basin for two days of hiking and a base camp to explore and or fish the lakes.
Same for the cross countybroute to Echo Lake and Matthew
North Rim is another option if you want to stay a bit warmer...
Bridalveil Creek to Royal Arches Lake loop
Glen Aulin to Young Lakes and back into TM..
We also like the East side trailheads,,,and Emigrant Wilderness, just north of Yosemite, has some great hikes at slightly lower elevations,,,