When MapQuest's general manager woke up in Toronto on Thursday morning, the Texan visiting for a conference knew he couldn't leave without visiting one place. Doug Berger made a beeline south from his hotel, wandering past the dock where the ill-fated Captain John's restaurant used to moor and heading deeper toward the city's shoreline. The vast body of water he arrived at — Lake Ontario — was an essential stop for Berger because it made his co…