I have not done that tour and actually did not see it offered. Sloths are all over and you should see some on any tour but I guess you would definatly get to see them up close and personal on that one. The Grand Tour takes you through the old Naval Hospitial where you will probably see some and out onto the Gatun Lake where I know you will see some and to an Eberia Indian Village where there are a few more in the trees. Then another short trip to the Canal to see the locks. Grat tour to see a number of differant things and some wildlife but not really up close.
Thanks Jim, I hear we can hug a sloth and get a photo with one so that is pretty up close and personal. Im also on the Grand tour in Panama and read wonderful reviews on that one. The canal tour I was refering to is the Touargo Canal tour in Costa Rica that I've heard is also a good wild life tour, but I will probally stick to the sloth sanctuary anyway.