Firstly, the tourism expert suggests that people should pick a place they are "fascinated" by.
She notes: "Vacationers need to be readily and effortlessly absorbed by things they see and do at a destination.
"It is important for a travel destination to provide environments and activities that can pique your imagination and curiosity without requiring you to exert the mental energy associated with your everyday life."
Next up, Lehto says tourists should pick a place they feel "compatible" with so they 'don't exert energy feeling anxious or having intensity of cognition'.
She says if people feel "in harmony" with their surroundings they are more likely to feel recharged and refreshed.
The fourth factor for relaxation, according to Lehto, is "away-ness".
This could involve jetting to somewhere where the "smell is unique" or the "landscape is interesting" so you feel physically and mentally far away from the stresses of your everyday life.
Finally, Lehto says holidaymakers should "orient" themselves so they "feel at ease".
This could involve using resort services and following signs so travellers can gain a sense of place and feel settled.
Lehto said she launched her 2013 study in a bid to help people plan a peaceful holiday in an ever-more demanding work environment.
One in three American employees are viewed as being chronically overworked, while half of the United States workforce receives fewer than 15 days off per year, according to the US Families and Work Institute.