Kateinyork,
I would imagine you simply have to get in touch with the consular section of the embassy of whichever country you're planning to spend your vacation in. If you're going to several countries, like taking a ferry to France to drive on to Spain, I believe you should apply for a visa at the embassy of the country where you first enter the Schengen area. In this case, the French embassy. Or Belgium if the ferry's port of arrival is in that country (Zeebrugge, Ostende). I'm sure you can find the info you need about the application process by doing a straightforward google search.
Thanks for that - very helpful! I love this site!