So basically he can't buy two tickets to Tahiti and just "happen" to have an extra one? $50,000 is a difficult amount to imagine using all in one or two goes with spending it (in small amounts) for others.

Spend it on a bachelorette auction where Lois is the subject of the date (I'm trying to remember how much the guy from Ireland spent on his date with Lois.). Then again, that would be going against the "no charity" rule, wouldn't it?

*scratching my head*
I know what Lois would suggest:

Lois: Why don't you get a car, Clark? You'd finally be able to get where you need to go without bumming a ride from me or getting ripped off by the cabs.

Of course, we all know he doesn't need one, and I've never gotten the feeling that he really desires one either.

The only thing I can truly imagine him using it on is a townhouse or something along those lines. Knowing how much work he put into the flat he lives at now a fixer-upper would be a cinch for him. I can just imagine Lois's response to his purchase...

Lois:I can't believe you spent all that money on this dump. Couldn't you have just spent it on a down payment instead?

CLARK: No. I'm just worried I'm a jinx.
JONATHAN: A jinx?
CLARK: Yeah. Let's face it, ever since she's known me, Lois's been kidnapped, frozen, pushed off buildings, almost stabbed, poisoned, buried alive and who knows what else, and it's all because of me.
-"Contact" (You're not her jinx, you're her blessing.)