You can access the trailhead via the Cucamonga Truck Road. There is a small pull-off with space for a handful of cars, but there's not an official parking lot. You can also access this trail from the Icehouse Canyon Trail
(from the West), where you'll meet the Cucamonga Peak Trail to continue east to the Cucamonga summit.
During this run you'll have plenty of time to look around at the views, as much of the trail follows the top of a ridgeline. Gaining the ridge is the most difficult part of the trail, and you'll pick up about 2,000 ft. of elevation along the way. The grade is consistent on the way to Cucamonga Peak, but you'll drop elevation quickly on the way down.
From the summit, visitors have two options: they can descend the route that they just took up, or they can drop down the other side of the peak, which leads to another parking lot. This is only recommended if you've already arranged a shuttle, or if a car is waiting at both trailheads.