I'm debating options for a trip mid-April and appreciate any advice from others. Option A is to book the 3-hour Colorado river raft tour, which has you rafting (floating) immediately below the dam. It's a longer raft tour that ends on the Arizona side of the Colorado river. This option would have us stopping in the visitor center but skipping the guided dam tour, for which you can't purchase tickets in advance anyway. Option B is the postcard raft tour, which is 1.5 hours on the Colorado river. I think that with this option we would attempt to get tickets to a guided dam tour. Our group is 2 adults, 2 teenagers and a tween.