$5000 to get rid of the credit card debt -- this will save you money every month; start putting that money into savings -- this might end up being for cars, college, whatever . . . but start saving what you've been paying to the credit card company. Hypothetically, this is a great opportunity to wipe out credit card debt in one fell swoop; most people don't get this opportunity.
And, of course, it goes without saying, don't run them up again! With that credit card bill gone, you're going to find your budget easier to live with. Saving isn't as hard as paying a bill -- it's rewarding to see the magic of compound interest working in your favor.
Having been responsible with that first $5000 . . . use $2000 for a Disney trip. That's plenty for a reasonable trip (not a luxury trip, not a bare-bones trip). With these numbers, that's realistic. You can't squander this hypothetical opportunity, and you'll have just as much fun with a moderate trip as you will a luxury trip -- and no guilt later.
And the remaining $8000 needs to go into savings. You don't have a lot of savings right now, and it sounds like BOTH of your cars may need replacing. I would not do this until the wheels fall off (and they don't make them any more) because you're not going to get much of a trade for a high-mileage van or a rotting-away Subaru. So keep going with what you have for now, and put this $8000 away for the day when you're forced to get something new.
Also, as the mother of a 13 and a 16 year old, I must warn you that your kids are in the "cheap stage" right now, but that's going to change in the fairly near future. Braces, cars and insurance, and college will be realities for you sooner than you think (I'm not particularly indulgent with my kids' wishes, but teens are more expensive than you expect). If you're just making it now, you're going to fall behind when those big-ticket things come your way. That $8000 financial cushion will help you, but you need to find ways to build it every month. Your kids are both school-aged now; it might be time for your wife to find a part-time job. It'll be better to do this before you hit those teen years.
As much as I believe in paying off mortgages ASAP, in your case, I think you need the savings more. Your mortgage isn't all that high in the first place, and you're able to pay it now. On the other hand, your vehicles are likely to become a crisis in the next years, and you need the emergency savings.