For an easy, family-friendly hike with beautiful views, head to Bridalveil Fall. Located near the Yosemite ... which leads to the park's south exit. This trail and waterfall are open year-round.
Take the short, paved Bridalveil Fall Trail right up to the base of the 620-foot falls. There is plenty of parking at the trailhead, and you should already be able to see the waterfall above you ...