IMG_0152_top Published October 24, 2011 at 800 × 600 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! The summit of Mt. Diablo. If the gift shop is open, you can buy $1 cold cokes inside. Not that we would do anything like that. The summit of Mt. Diablo. If the gift shop is open, you can buy $1 cold cokes inside. Not that we would do anything like that.