We are also thinking of booking a segway tour in Barcelona.
Dr. Dave and I rode Segway tours in several countries (we were the first to do so in Rome... We actually had to
teach our private tour guide
how to use the Segway!! 

Numerous Roman adults and children stared and asked questions (moreso than in other countries we visited) because they had never seen one before. Even with Segways everywhere now, be prepared that strangers will take pictures of you.
Segway tours are a very easy way to get the lay of the land, can be informative if you have the right guide with you, and we highly recommend them.
Anyone going to Montserrat full day?
We visited Monsterrat and spent 3/4 of a day to do it. The travel from Barcelona is further than we thought, since you have to drive up into the serrated mountains (...the literal meaning of
Mont serrat) and it's a twisty road--think California's Yosemite National Park.
This entire area feels very sacred (and we're just spiritual if not anything else). The monastery was the main point-of-interest for us, especially seeing the Lady Madonna or Black Maddona of Monterrat
(La Moreneta). We waited in a line that was about a half an hour long, through dark hallways and ancient stairwells,
and it was worth it...
The Black Madonna is royally perched in a GORGEOUS gold mosiac-lined room that is the size of a walk-in closet... only 1-2 people at a time can enter or fit! It is a very personal encounter with the statue. Also, I cannot truly describe the beauty of that Madonna's room... It rivalled the gold mosaic walls of St. Mark's Basilica in Venice.
We ate at the large outdoor patio restaurant that was connected to the Montserrat gift shop, right at the mouth of the entryway/parking lot. There was a very long line of people waiting for the tram/"funicular" all day, and we were so glad that we had taken a car! We did not do any hiking while we were up there, but there was a trail on the edge of the mountain, behind the tram, which led to a cave in the mountainside... and that
seemed nice.
I decided not to take the risk. I found that there were ferries that go over to Morocco, but the times were extremely limited, plus, it took forever. With the time in port, and the time to get all the way over there, there was hardly any time and that is if we can even trust that the ferries would be accurate and trustworthy.
We have also decided not to go to Morocco from Gibraltar, because Tangier (the closest point by ferry) is NOT REPRESENTATIVE of the true Moroccan city that we idealize as Americans.
Tangier is similar to Tijuana... and we all know that Tijuana is not representative of Mexico.
On a future visit to this part of the world, it would be better to spend some time and visit Marrakesh, Fez, and perhaps even Casablanca.