Hi,

I am not pretty sure of how much time or documents would take you to get married in a civil ceremony (by a judge, in a court), but most people, specially when they speak of beautiful places to get married in, think of a church. To get married in an ordinary church, you would have both to be catholic, and to reserve a place some months in advance (the more months the more fashionable the church is). It may also be rather expensive.

For both kinds of marriage, as MM said, towns will have more days free in the mayor's or judge's schedule.

Bear in mind that, in Spain, except for Catalonia, unless you say the opposite, the marriage type is gananciales (sharing all future incomes) instead of separación de bienes (separated incomes), and that in case (let's hope it will never happen - but sometimes it does) of separation, you will be ruled by the laws of the country where you got married - Spain.