We got the Big Bus around 930 am, near Navy Pier. It was a really hot morning on what turned out to be a scorching day. All staff members were great, from the guy we bough the tickets from, to the guides (Reggie and Ken) and drivers. We paid $75 each for a day tour plus the river tour. Worth the money. This tour is great, with plenty of stops along most of Chicago´s landmarks. I d recommend doing the whole tour first and only start hoping on and off after that. The reason being that (at least on our particular day) trying to get on the bus at most stops is quite difficult since the buses are always very busy. On our second "hop on", trying to get on was a struggle. No respect for who´s been queuing for a while, no real lines, people rush past you, pushing everyone out of the way and there´s very little the staff at the stops can do about it. But apart from that, do go on the tour and enjoy!