I am on a Norwegian epic cruise, we dock there, would love to do a tour? Any idea how far this is from where ships dock
Columbus statue ( mirador de Colon) is placed on a tall column on the port, at the end of La Rambla. Everyone knows where it is. Once you find it, you just need to go up La Rambla to find the bike shop. But make sure you have reservations.
Otherwise, if you are short on time, you can visit the old town (ciutat vella: old cathedral, Picasso museum (reservation), Guell mansion (Gaudi earliest work), royal plazza; and the beautiful Montjuic parc with the Miro museum and Catalan Art museum.
In order to see Gaudi's masterpieces, you'll have to take a taxi or subway first to Paseig de Gracia station or Diagonal station for La Pedrera and Casa Batlo. Then on to La Sagrada Familia (Sagrada Familia station).