Lloret de mar (tree by beach)
Nice town, quiet, nice beach, has a great night life and plenty of things to do.
Renfe is your local transport (Train service that runs down the coast line and you can change at Girona/Salt for direct train to Barcelona etc)
Drinks are dead cheap in the supermarket, 6 bottles of San Miguel is less than 2 euros, if you was to eat and drink out you will be expected to pay in the region of 1.50 - 3.00 euros a bottle. Local food is average priced, again dead cheap in the supermarkets if you was to go self catering.
Lloret de Mar is a average priced place, has a massive market on Saturdays so you will be able to find many things cheap.
What to do in Lloret de mar? It depends on what you like.