What are some fun things to do in Yosemite National Park this time of year?

I really want to take a one day hike, but not sure which trails would be open due to the season. Any advice?

The Upper Yosemite Fall hike is excellent! It’s neat to see the rushing water from the top. What a contrast to see this same view in the Fall when the water level is way down. This is a great hike!