Adams Trailhead is a popular place and is usually pretty full in the evenings. I've counted up to 70 vehicles in the parking lot. It's especially crowded on Monday Evenings (Local "Family" night) and Wednesday evenings (Local Boy Scout night).
Adams Trailhead hooks up with a number of trails. After proceeding up the the switchbacks (about a 1/2 mile), if you go left you'll be on Bonneville Shoreline Trail and will reach Kayscreek/Fernwood in about 2 miles. Also at the top of the switchbacks, you'll can see a faint trail right up the side of the mountain that is an unoffical route to Layton Peak.
If you proceed into the canyon, in about a 1/4 mile there is another split in the trail. Across the bridge, to the right will take you to Kaysville Wilderness area (about 1.5 miles) on the Bonneville Shoreline Trail.
If you continue straight into the canyon through the forest for 1.3 miles, you'll reach the waterfall and that is most people's destination.