What Non-Real Estate Vehicle Are You Investing in for 2018?

[Tim Porsche]

Like the title says I'm just curious to see what you all are investing in other than real estate (if anything) for 2018. I have a few rental properties already, all doing well, but I am about to inherit some money and am thinking it would be smart to use that to diversify into something other than real estate. The two main vehicles I have been thinking about are...

1. Putting it into an index fund that tracks the market as a whole.

2. Putting it into a good, well established REIT fund like Vanguard's.

The hesitation I have with the above, however, is that real estate is as we all know very high right now and we all know the old mantra, buy low, sell high. I also have the same concern with putting it into the stock market at this time. 

I realized both the REITs and stocks could keep going up and up for another several years...but the opposite is also possible. I know if I keep it invested long term...15+ years...it is almost guaranteed to increase in value even if it crashes in the short term. However, I'd prefer to avoid that dive in value if possible. 

So, back to my original question. What are you all investing in now other than real estate? Any feedback is much appreciated :)