In reply to Simon Caldwell:
Yr.no has good weather stats on anywhere you might want to go, which gives an idea of how rainy somewhere usually is.
If you're flying to Barcelona, all the car hire places are very quick apart from Goldcar. Most of the offices are in the airport and will sort you out very quickly, especially if you arrive at night. Goldcar is offsite and you need to take a shuttlebus, their office is slow and they sting you for extra charges at the end - avoid if you want a quick hassle free trip.
Catalunya good, if you can find the flights. South of France also, fly to Marseille and Buoux, St Victoire, Toulon, etc all within 1 - 2 hours drive.