There’s too much concrete in the world and most of it is unnecessary. Here’s one alternative that you may have seen at the beach: low-impact, modular walkways made out of sustainable timber.
The company, Mister Boardwalk, even makes “roll out” walkways that simply roll out on top of grass, wood chips, sand, gravel or old concrete. The company specifies that their pressure treated southern pine does not contain arsenic, and their cypress and teak are certified as responsibly harvested and are chemical free.
They also offer Trex, which is a recycled composite combining hardwood sawdust and recycled plastic shopping bags. They have a page with much more details on their materials. They also offer shower mats, doormats, decks and various other things.