City break - October half term

[mamagoo]

I'd appreciate any recommendations for a city break in half term. It's for 2 adults and 5 year old.

Ideally we only want to travel 2 hours. Somewhere warm ?? With plenty to do.

Thanks in advance

Valencia?

Barcelona?
Beach, pedestrain areas, lots of kid friendly activities like aquarium, 3D cinema, lots for adults to appreciate.
Weather is normally a month behind us ; so should be like September in the SE of England.

Rome is also good for kids as is Jersey