2-3 nights in Costa Brava (no car)

Hi! My girlfriend and I are booking a one week vacation to Spain. We will fly into Barcelona, spend 5 nights there, breaking it up with 2 nights in Costa Brava in the middle. We are struggling to pick which town is the best for our purposes. We want to be able to go to beautiful beaches with a scenic town, great restaurants, etc. we won’t have a car either, plan to take a bus from Barcelona to wherever we choose (and then taxi if we have to). Please help us choose a place!!! Thank you for your tips!