You might want to start off with a google search for scrapbook supplies with a travel or vacation theme You should be able to find Spanish stuff somewhere on the web.
I did an album for my daughter and sil's trip to Italy. I had some generic travel/vacation papers, stickers and other embellishments, but I had quite a few specifically for Italy, but I had been searching for a while before they went on the trip. I picked up some wine designs and some religious designs because of some of the activities and tours they took. You might want to use designs on some pages about the activities you participated in besides those specific to the country, like food or sports. I used red, green and white cardstock on several pages because that's the colors of the Italian flag.
Hope this helps a little. Have fun reliving your wonderful experience!