"Only way to go all the way through and return to the same port is to book back to back transit cruises. Other wise the ship will turn around in the lake claiming if you have seen one set of locks, you've seen them all."
Is that true? I thought some of the most interesting sites are on the Pacific side. I'll probably never get back to Panama again, so I'd like to see everything. Would I be missing something great by just going as far as the lake? I've heard that the Bridge of the Americas (do I have the name right?) is something I shouldn't miss. I think there is something else recommended, but I can't remember what it was right now.