When do u unlock the stone tile and sand tile paths for ur island

you unlock them as soon as you unlock terraforming and you can buy them from the “redeem nook miles” section of the terminal at resident services ;;
 
I believe you unlock them after you get your town to 3 starts and get KK Slider to come.
You will get terraforming from Nook.
 
As above.. speak to Isabelle for your island rating and once you reach 3 stars KK will visit. Then you'll unlock the ability to purchase these options with nook miles :)
 
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