You can make ANY island spider island if you do the following:
- chop all trees and remove stumps
- pick all flowers (pick, not uproot)
- remove all rocks
- night time only (past 7 worked for me)
- dump resources on beach
- clear island of all bugs

= spiders spawn https://t.co/PqGJTCxAu9

— Zach Soares (@Voxels) March 22, 2020