Advice for last day in Barcelona

I'd be concerned that a combo tour hitting both the Dali Theatre-Museum in Figueres and the house in Port Lligat wouldn't allow insufficient time at the DT-M. It has been my experience that tour groups go through art museums quite fast, as if they're catering to people who really aren't all that interested in the art. So: How interested are you in Dali? I don't really like Surrealism, but I was surprised to find I really enjoyed the DT-M. I think I spent about 3 hours there. The ticket also covers the nearby jewelry collection, which is fabulous and might require 20-30 minutes. The DT-M does get some bus tours, so it wouldn't be safe to show up without a ticket, expecting to get in immediately; you might or might not. I don't think the place sells out way in advance, but individual time blocks could fill up early.

I believe the visit to the Dali house may be by guided tour. If that's the case, I think your tour would allow you the same time an independent traveler would have there. Incidentally, capacity is very limited at the house; that ticket needs to be purchased way in advance. (Check now for early April!)

Trying to get to both places on your own, on the last day of your trip, could be quite hectic. If I were going to do that, I'd go to Port Lligat first, since it's more awkward to reach: fast train to Figueres Vilafant station, walk/taxi/bus to the other ("Figueres") station, bus from outside that station to Cadaques, walk to Port Lligat. The bus isn't terribly frequent, so I just wouldn't attempt the combo trip independently on my last day in Barcelona.

It would be perfectly reasonable, however, to hop on the train to Figueres and see the Dali Theatre-Museum on your own.

Alternatively, you could take a day trip to historic Girona (closer than Figueres).

Barcelona is a highly walkable city with interesting architecture. You didn't mention seeing the Palau de la Musica Catalana or the Sant Pau modernista site, neither designed by Gaudi but very striking. There are tours of the Palau; English tours may sell out in advance. Many folks opt to attend a performance there and see part of the building that way. The Sant Pau site doesn't require purchase of tickets in advance; you should be able to walk up and get right in.

The city also has multiple art museums, including the large MNAC. The MNAC has a good collection of modernista decorative art, furniture and jewelry, in addition to the expected paintings and sculptures.

I have friends who did an all-day tour with a guide to the Dali Theatre Museum and house, starting in Barcelona. Although they already knew a lot about Dali's works, they found they had enough time.It depends on the size of your group.

Last fall I went both places, as well as Gala's castle. The house is seen only via small guided tours; so you spend time waiting for everyone in your group to have a visit. The Theatre Museum, which we saw the day after the house and castle, needs 2-3 hours, depending on your interest in his work. I arrived at the Theatre Museum still indifferent but left convinced of his importance in art history.

You could easily go on your own, and at your own pace, by train. The house is interesting but not necessary if you want a more relaxed visit. The Theatre Museum is the major work.

If I were planning, I would take a day trip the second to last day in Barcelona, and leave the last day for Barcelona.

you might be back in Barcelona... try this: https://www.barcelonaturisme.com/wv3/en/page/1213/canaletes-fountain.html ;))

birding group

... excuse my naivety, this refers to a group of people that likes to observe birds, doesn't it? or is it slang for something else?

If so, here's one more reason to come back to Catalonia: the Natural Park of Delta de l'Ebre River, one of the most important wetlands in Europe, crucial for biodiversity conservation. It serves as a key stopover for migratory birds on the East Atlantic Flyway, hosting over 300 bird species, including flamingos and herons. The area is designated as a Ramsar Wetland of International Importance and a Natura 2000 site, ensuring protection under EU environmental directives. Additionally, it plays a vital role in rice cultivation, coastal protection, and climate regulation, making it essential for both ecological balance and sustainable agriculture in Southern Europe. https://www.ebrebiosfera.org/

Been to the Dali Museum, it was good, but I am not a huge modern art fan.

Consider going to Monserrat.

I’m a big fan of the Montjuic area, if you haven’t already done it. It’s easy to navigate, you could do cable car or funicular and then bus 150 or feet get you around to visit what you choose, either museums, gardens or open spaces. It’s calming as it’s not on everyone’s lists so it doesn’t get the crowds, but you are still relatively close to home base for last minute travel details.