Spain - stroller for a 5 year old who doesn’t love walking?

My 5 year old doesn’t last very long walking and she still naps midday, but only if we are in the car (so maybe shed nap in a stroller?). She is the same height/weight as my 7 year old so carrying her gets tough.

We will be in Spain for 4 weeks - Madrid, Granada, Logroño, San Sebastian, Bilbao

Do we bring a stroller? Buy one there if we end up wanting one?

Some other better option??