Have $40,000. Where would you put it for the best return??

[Robert DeForge]

So, my wife and I have been have been saving for a while, which isn't really easy. (Two kids, tuition, CA prices..)  But we do live a pretty thrifty lifestyle. 2001 ford truck for me and 2010 Pilot for the Mrs. All paid off and very little CC debt. Mortgage on our PR is $1500/mo. 

That said, where would you park your $40k? Strongly feeling this bubble is near the popping point, and don't want to make the same mistake I've seen so many make. I'm really getting interested in MF syndication.