Mulch can be a great pathway alternative in tropical climates. We are a mulch company in Orlando, FL which is not quite tropical, but the heat conditions are similar.
Using some sort of bark mulch or even pine needles as a ground cover can work well as a rustic pathway.
If you're looking to use stones make sure to keep them cleaned every once in a while. They will also be slippery when wet.
Major Mulch Installations
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