Although I’ve been to Barcelona several times and my daughter used to live there, I’ve never done a boat tour. Google Barcolna waterspouts.es. They sound quite reasonable. Must see is La Sagrada Familia and some of Guadi’s landmarks. The underground (metro) is quite easy to use. Barcelona is actually a beautiful and easy city to get around, but watch for pick pockets in the Las Ramblas area as this is unfortunately infamous here.