City break with 3 year old

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we are looking at booking a city break for October time with our 3 year old - probably only 3/4 days. Can anyone recommend anywhere that’s got things to do for toddlers?

York?
The national railway museum is great for all ages, and the Yorkshire Museum has things for under 5s.

here are you based? London is great for that age, weather may not be.

UK or abroad?

Does your 3 year old have afternoon naps / sit in a push chair? If they sleep for a while that gives an option to do adult activities.

She sits in a pushchair yes, but most likely won’t nap in one.
Im more abroad to make the most of the weather!

Barcelona - there’s Mt Tibidabo, a brilliant aquarium, beach, science centre and lots of parks and playgrounds.