Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

what would you do with $100K saving? 
The real answer is "Why do you want to waste a windfall chasing quick returns?"  Instead, use this windfall to improve your financial situation, and maybe boost you toward financial independence, or at least a secure retirement.  In simplest terms, forget the short term, go for long term.  Whatever you do, avoid lifestyle creep.