I have a house in spain and fly into gibraltar. actually i am flying tomorrow from gatwick.
gibraltar is very small but full of history.very funny feeling to be abroad but have main street which has all the english shops(british shops!)
i generally go into gib to get shopping and be able to use sterling as its cheaper at the moment.i think you may find a short stay there could be long enough.
concerts on from time to time.saw elton john there a few years ago not a very pretty place but if you want cheap ciggies and drink its the pklace to go.