In my view, "back to nature" means respecting the rhythm of nature and appreciating what nature has to offer.
Personally, I try to avoid out-of-season fruits and vegetables http://www.dailymail.co.uk/health/article-388149/Fooled-fruit-thats-seas... and manufactured products made of synthetic material such as plastic that is difficult to recycle. I choose to wear clothing made of natural fibers, cotton or bamboo http://en.wikipedia.org/wiki/Bamboo_textiles , wool, or leather in some cases, rather than waste sheepskin or cowhide from domesticated animals that are killed for food, and resort to natural alternatives such as honey http://en.wikipedia.org/wiki/Urban_beekeeping to sooth a minor sore throat https://store.mayoclinic.com/products/books/details.cfm?mpid=62 . I often use a bicycle or walk rather than drive anywhere within three miles.
I look for beauty in nature, wherever I can find it, admiring the blossoms in season http://en.wikipedia.org/wiki/Hanami and the changing phases of the moon http://en.wikipedia.org/wiki/Tsukimi in the night sky. I'm interested in finding ways to collect rainwater http://en.wikipedia.org/wiki/Rainwater_harvesting to water potted plants and identifying companion plants to keep my plants happy. http://en.wikipedia.org/wiki/Companion_planting
What makes sense to me is the small ecological footprint http://en.wikipedia.org/wiki/Ecological_footprint and better distribution of natural and human resources. Even if it means being closer to the ocean, I would not go on a cruise http://en.wikipedia.org/wiki/Environmental_impact_of_shipping , unless it makes good ecological sense.
Back to nature doesn't have to mean sleeping inside a mosquito net or camping in the wilderness teeming with dangerous animals. It could mean giving back some space to nature within an urban setting, planting more trees and building more parks on rooftops http://en.wikipedia.org/wiki/Roof_garden . It means planting organic vegetable gardens http://www.pbs.org/wnet/need-to-know/health/the-dirty-dozen-and-clean-15... and eating more locally http://en.wikipedia.org/wiki/The_100-Mile_Diet . It means going back to eating whole grains with complex carbohydrates instead of the refined version with higher glycemic index. It means making sure that the tap water is free of pharmaceutical traces http://www.who.int/water_sanitation_health/publications/2011/pharmaceuti... so that the city residents and visitors don't have to purchase bottled water. It means using ladybugs and nematodes instead of insecticide http://en.wikipedia.org/wiki/Biological_pest_control to control pest insects in one's backyard. It means making sure that the air we breathe is free of industrial pollution. It means finding better ways to produce ecologically sustainable products such as bamboo textile and flooring. It means making sure that there are enough trees in the world http://en.wikipedia.org/wiki/Forest_farming to produce the oxygen we need. It means developing alternative eco-friendly solutions. http://www.conservatree.org/paperlisteningstudy/Forests/question61.html
Visitors of pristine national parks are asked to take only pictures and leave only footprints, for a reason. Going back to nature means finding our way back instead of continuing to alienate ourselves from nature by overexploiting it. It is about recognizing that everything is connected, that we are a part of nature.