Getting out of the BART station is a little tricky; take the narrow ramp to your right when exiting the station, and then get on the foot bridge over the freeway entrance (not the footpath that goes under the freeway). After the foot bridge there’s a slightly awkward turn off the sidewalk onto Orinda Way.
Miner is a pretty road by the golf course, which usually has some traffic until we turn off on Lombardy (just before Miner goes up a hill to the right). The rest are quiet residential roads. The turn onto Sundown Terrace has a gate as the route goes through a small park. There’s a short, steep climb at the end of Sundown.
To the right, Happy Valley coasts downhill to Lafayette BART. To the left, it has a steep, twisty climb, usually with bad pavement, followed by a steep, twisty descent, usually with bad pavement. It’s fun, but be careful. There’s one hairpin on the descent marked as 10MPH; slow way down for that.