The most incredible grounding Ive done was going down the the beach and burring my feet in the sand
Then break out different frequencies of singing bowls
You can really feel the transference of energy
The first time was with a brass bowl tuned to 741hz which I read is the earths frequency
I can’t describe the feeling but was rather intense yet peaceful
I could feel it flow

I walk my dog on "illicit" grass ("no dogs allowed") every morning in NYC to get some nature under his paws. He goes to the bathroom elsewhere, then I take him on a brisk, leashed walk (the patch of grass is tiny). I've been yelled at for it, but we ALL need nature, and I respect the lawn. All cement is no good for anyone!