We did a partial transit as well, through the new locks. Hubby was up and out before dawn to get a place overlooking the bow. The above suggestions were perfect in that it is a great idea to go up high and move around to see it all. We had an aft balcony cabin and enjoyed the vantage point from there after traversing all the locks.
We took an excursion that day (would never do that again!) and it was incredibly hot and humid. It was a tour at the Visitor Center not far from the ship (mildly interesting) and then a bus &train tour to West coast, Colon. Nothing much to see, stopped for restrooms and everyone got ice cream. Train ride back which took forever, were supposed to have lunch enroute, we were handed small boxes of cheese, sausage and crackers with a bottle of water. Long, slow, hot train ride back. We were then delayed going to ship as they were not at the port yet so we were taken to a shopping center to a touristy/souvenir shop to kill time. We were two hours later getting back to ship and actually departed late due to waiting for remaining passengers. So…….you may want to follow above advice and stay on the ship. Locks and canal ARE impressive though!
Just my two cents. 🤷♀️