I actually live in a very touristy area in Spain. In fact it's the most touristy region not just in Spain but in all of the EU apparently, in terms of nights spent:
https://ec.europa.eu/eurostat/statistics-explained/index.php/Tourism_statistics_at_regional_levelAlmost all tourists here come from Europe, mostly from the UK, the Netherlands, other regions of Spain, Germany and Scandinavia. I barely see any non EU tourists whatsoever, the only country that even makes a dent in statistics is Switzerland.
But non-EU non-Swiss tourism accounts for only around 3.5% of all tourists here
http://www.grancanaria.com/turismo/nl/area-profesional/informes-y-estadisticas/estadisticas/Then again tourism here is a "beach and sun" kind of tourism for the most part, I imagine most Americans looking for that simply stay in the US and go to Hawaii/California/Florida or wherever, or go to the Caribbean or Mexico.
Granted, this is all anectodal evidence from just one place. But in most tourist destinations in Europe Americans are barely a dent, even within "non European" tourists. However, the landscape of tourism is very different in Paris than in say, the Mediterranean.