The Mappiness app randomly pinged the 22K person UK study group asking what they were doing & feeling and by GPS checked their surroundings. The Brits were only in green space 7% of the time, but were as happy as being with a loved one or doing their favorite activity, just by being in nature!!

“Study participants are significantly and substantially happier outdoors in all green or natural habitats than they are in urban environments.”

https://eprints.lse.ac.uk/49376/1/Mourato_Happiness_greater_natural_2013.pdf