I personally would not kick down a Sand Castle whether nobody is around or not and I also would not want to wait until the tide reaches it.
I would admire it and continue on with my day. :/
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Hi. If you are reading this, every like you give is a dollar that goes towards my training to become a whale. I have already cut both my arms off and can hold my breath for 11 minutes. My goal is to get into Sea World. Thank you