Beautiful city. The only negative was air pollution heavy enough to trigger my allergies. The air looked a bit like the brown soup in LA.
We boarded here. Nice terminal very close to the city. The HOHO bus hit most of the high spots and had we had 3-4 days we could have seen the sights in depth. An afternoon is nowhere near enough to do this large city justice.
Seeing the rock and touring the fortifications was certainly worth the time. The monkeys are nasty. Feces and urine all over in the areas they are fed. A couple of our fellow passengers were jumped on.
Otherwise, GIB has little to offer beyond shopping better done in bigger cities. We did see some nice ceramic work but the rest of the high street was nothing special.
The highlight was entering the harbor just after daybreak. We could clearly see Morocco in the distance.
We had perfect weather in London. 85 F and sunny which if you haven't lived here is truly rare early in June. The passage up the Thames to Greenwich was a highlight of the cruise. We had informed commentary from a local river guide which really helped me imagine how sailing up this river must have been for mariners the last 1000+ years.
The only downside to having 18 hours in London, is you only have 18 hours and that only if you don't sleep.
Tendering was not terribly efficient. The ships crew did a better job at the other tender port. Greenwich now has good links into the city via DLR and the river boats. The location makes for easy access to the main sights in the West End.
Another beautiful historic city. The dock is very close to town though with a bunch of building making walking to the train station and then into the old town a bit challenging.
The canal tour is a great way to see the city. Anne Frank's Museum is very moving and worth the time spent. The floating flower market was lovely and it's pretty humorous to see marijuana plants/seed for sale. Gotta love the Dutch permissiveness.
CPH is a major cruise embarkation/disembarkation point. The terminal was well organized, our luggage was waiting on us and there were plenty of taxis to town/airport/train. There's not much near the ship terminal itself. Cost about $30 to Tivoli/Copenhagen H train station IIRC.
CPH is similar to Amsterdam - canals, restaurants, lovely squares etc. Worth a couple of days at the beginning/end of a trip. Stockholm is prettier and only 5 hrs away by fast train though the train isn't cheap.