Don't confuse ideology with achievement. Whether or not few, some, many or even most Americans actually own a boat and can thus 'head for the hills' each weekend is not the point. Enjoying the great outdoors through fishing, shooting or camping is part of their culture. Granted, inner city slum dwellers will have little opportunity to express it - and many may not wish to anyway, having far more immediate problems to deal with - but the educational system, from junior school through to college, is geared towards encouraging participation in such activities. Summer camps are still a major part of growing up there.
Compare that with the UK where, should a child develop an interest in fishing or nature, they will have precious little encouragement from their school. Fishing is not only ignored but, in some cases, postively discouraged. Nature studies are now more like an excercise in health and safety than an adventure. I speak from experience here; in the early nineties I did some voluntary work at an environmental education centre, looking after a three acre site. This was established in the early 1970's to supplement local schoolchildren's regular curriculum and teach them about the environment around them. In those days my job involved keeping the grass paths cut, maintaining (and constructing) ponds for 'dipping', hedge laying, cultivating a wild flower meadow to encourage insects and general maintenance. Oh yes, and cleaning out the donkeys. Unpleasant job, but an excellent source of worms!
Four or five years after I stopped working there (due to studying full time at college) I took a stroll around the site. They obviously did not need anyone to carry on my work, as the paths were all tarmac, the ponds filled in, the donkeys gone and any rogue nettles and brambles sprayed, presumably to avoid scratching or stinging visitors. Someone at the local authority had decided that the site presented too much risk. Shortly after this it closed down altogether, public funding being withdrawn completely, and finance becoming impossible to obtain through private sources.
There is a lesson here: if we end up as grumpy old men bemoaning the fact that the latest generation is interested in nothing that isn't commercially produced, highly fashionable and completely disposable, we'll have no-one to blame but ourselves.