My wife and I will be arriving in Barcelona on April 2nd. As we've previously seen many of the major sights (La Sagrada Familia, Park Guell, La Pedrera-Casa Mila, Jewish Quarter, Gothic Quarter, Basilica de Santa Maria, Barcelona Museum, Picasso Museum, Barceloneta Beach, Els 4Gats Restaurant and Las Ramblas), we're focused on seeing Casa Batlló, stopping for some tapas and wine (not on Las Ramblas) and we're looking for any other suggestions of things to do within walking distance. Also, we plan to take a taxi to/from the port and city and would like some hints on how much to expect to pay, how not to get scammed, and where in the city would we be able to find a reputable taxi, etc. I know this is a lot, but we'd appreciate any suggestions.