Maybe this sounds a bit odd, but here's what I would do.
Get a safe deposit box. Put the uncashed check in there. Just leave it for a while until I've wrapped my brain around having money and decide what to do with it. Maybe it would only take a couple of weeks to meet with a CPA and consider my options, but it might take me a couple of months, too.
It seems like if I cash a check, that I somehow feel like I must use the money. But if I don't cash it, feels like the pressure is off. Feels like I can take my time and make a good decision.
Of course, I'll never have to worry about an inheritance - LOL!
angela