We have returned from the Canal cruise on the Coral - inagural Jan 03.
Loved it - and a very classy ship. We also travelled with family and it worked out beautifully. We only went half way thru the canal, but this was fine. The train trip to the coast was fantastic according to other cruisers, we did the walk around the locks and learned a lot. We also did the historical fort tour and could of done with out this. The canal was as exciting as I expected it to be.
Hope this helps and it you need any further info I will be happy to oblige.