We did this same cruise last Sept. (if it is the last one of the season...we then went B2B with a WBTA). Flew in two days early with all Disney connections and hotel (Renaissance). Hotel was pricy, but they had a
DCL desk in the lobby where we could do some preboarding and confirm our bus to the Magic. The hotel was located in the heart of newer Barcelona...within walking distance of many Gaudi structures. Took the bus to Park Guell, on recommendation and directions provided by hotel staff. They couldn't be nicer...got us tickets (recommended) on their computer. When we fly overseas (from Portland, OR), we like to have no worries about connections, so go all Disney.
One thing I always warn folks about going the Barcelona is pickpockets. I got nailed in a gift shop across from the entrance to Park Guell...not much, just day money. The serious stuff and passports were in a belt under my shirt. There are videos on
YouTube about these pros and their scams. They even recruit kids because of their small hands. Keep your valuables close in all parts of the city.
The rest of the cruise will involve, if you schedule it so, long days and late meals (make servers aware of your schedule). However, it will be one of the most exciting and memory-making adventures you will ever take...enjoy!!!