In the immediate area, LEAX (Axarquia/Velez Malaga) about 30 kms east of Malaga is your only option. Be aware that officially radio there is Spanish only.
Gib can be done (I have), but it's neither easy nor cheap. IIRC also no overnight parking avail. You would also need to depart from/to a customs & immigration airfield, which makes the whole exercise even more complicated.
Not sure if Malaga LEMG would accommodate a motorglider, in any case they've recently hiked their fees to absurd levels and are IFR only for most of the week during the period you will be there.
Further west you could go into Villamartin, which is in the vicinity of Jerez. This is largely a Microlight field, rwy approx 1500ft, hard surface. Probably your best and cheapest option. You would, however, need to arrange transport as there are no services on the field (same, btw, for LEAX). Call them, it's run by a couple of Swiss guys who should be able to help you.
Last edited by 172driver; 30th Dec 2012 at 12:20.