Hi,

Renewing your tourist visa isn't as simple as just leaving the country for a few days and then coming back to Spain. The law says you are allowed to be in Spain for 90 days but within a 6 month period. Which means that technically if you are in Spain for 90 days you would then have to leave Spain for another 3 months (to total the 6 month period--3 in Spain and 3 somewhere else) until you could come back legally and get a new tourist visa. Personally, I wouldn't worry too much about overstaying the tourist visa--I don't think the Spanish police are really too interested in finding Americans who stay in Spain longer than they should