When I desire something instrumentally, I desire it because it’ll help me get something else. For example, I might desire to know my password to a website, because I want to log in to the website and knowing my password will enable to me to do so.
When I desire something non-instrumentally, I desire it for no instrumental reason whatsoever. If it led to no outcomes beyond itself, I would still desire it.
What, then, would be an example of a thing desired non-instrumentally? Pleasure? Discomfort alleviation? Cf “incentive salience” – a kind of desire distinguishable from the explicitly declarative, instrumental kind of desire. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2756052/