rainy day activities
Hi, Littlebird, once you tire of the Chinese supermarkets, here are some other thoughts:
Palma - offers a wealth of options
Caves at Campanet (you can take a taxi)
If it's just a bit cold and not pouring rain, one of our favourites is to take the bus from PP to Soller and back. It's a lovely ride through the mountains (if it's not totally rained in!) and you can have a nice lunch in Soller; see the Picasso/Miro exhibitions at the train station; and the Can Prunera museum is also well worth a visit. You could take the little train down to Puerto Soller but we never bother with that. For us, Soller is the attraction. There are a number of earlier posts with alternative travel routes for this trip.
Or you could hire a car in the Port for a couple of days; we did that one year when we had bad weather, using Hiper.
If you did that, the Caves at Capdepera are an option. They're quite spectacular! If you do that on a rainy day, make sure you have a waterproof poncho or similar 'cos parking can be tricky and you may have to walk a bit!
Again with a car, we enjoyed the Finca Els Calderers on a rainy day. It's a large manor house turned into an "museu etnologico" - lovely room interiors, interesting farming, interesting for both adults and children. We promised ourselves that we would go back one day in good weather as it has nice grounds as well.
I hope that you have such wonderful weather that you don't have to use any of these suggestions!