They don't need to travel, they got everything here in the US. Not only are there mountains, Geysers, oceans, hot springs, rivers, lakes but there are also Mexicans, Chinese, Japanese, Poles, Germans, etc. Why move a mountain when the mountain comes here?
You look from an American point of view (consumption = religion). What I meant - (not looking at the natural beauty) - what you can see and experience in Florida is the same in California, what is in Chicago is the same in New York - all the same people, buildings, MacDonalds, roads, police, pubs, motels, newspapers, food.
By irony, it's a similar situation to what was in Poland or Russia during communism - most people would not get a passport to see other countries then. But when some of them did, they realized Poland or Russia are 100 years behind the "bad West" in many aspects. In the US it's different - people have enough food, TV, place to live, and a car - that's enough to make them "happy", but lazy and ignorant at the same time to check what is going on outside their backyard.
Most Americans believe what they see on TV more than they would believe their own parents -- the problem is the US TV shows only very limited and selected views which are good for the people who govern the country or their "sponsors"/lobbyists.
How about learning about new, NON-Americanized, culture, way of life, people, news-media, food, even shops? This is what Americans miss and they don't even realize how different and - many times - better the life on the other parts of the world could be.