Barber Lake's roadside access makes it a great place to start, stop, or turn around on a ride along the nearby Barber Lake Trail (sometimes also called the Libby Creek Trail, since it ties in to the trail of that same name). If you start your ride here you can power up the trail's consistent elevation gain, then pretty much coast on the way back. Or you can make a loop by riding one way on Barber Lake Road. Barber Lake Trail, itself, is fun single and double track.
Believe it or not, this is a great place for spotting butterflies too. Keep an eye out for species like the hoary anglewing and the green comma if you pause in your ride.