THis was an excursion to the MInaflores locks, then to the Albrook MAll for shopping, before being dropped off at the airport. The canal and locks are amazing, Albrook is HUGE if you like shopping ( we were at the mall for about 3 hours) and the cost of the tour is comparable to a straight airport transfer. This tour only works if yof you have a late afternoon flight.
Also, be aware, at the airport, we had to go through 2 security checks, one as per usual on the way to the gate, and then another, complete with metal detector and bag screening, at the gate itself. It seems , however, that as flight time approaches and they have to get the plane loaded, this get check becomes more cursory, and the line moves much more quickly.