As a traveler I tend to share places while traveling. In my opinion, the best way to help a visitor is by being the visitor. For example, I like to share my experience of walking in the streets of Darjeeling and why their market place is so interesting. I love to give pauses while on road trip just to enjoy the view and I would recommend the tourist to stop at a certain place.
On a different note, I would recommend people to go and see Grand Canyon, Arizona when it is expected to snow. You never know when you get lucky (like me) to see Red mountains and White mountains (After snow) in just 2 days of stay. Also, I would mention the cautions and problems a fellow traveler might face. For example, you need to be a good driver while driving during snowfall and an expert driver while driving during or after snowfall at Arizona.
In short, my idea of contributing in Google local guides by not being just a ‘local’ guide. Instead I would like to be a GGG - Google Global Guide.