You've probably noticed a Mountain Dew floating around 
somewhere. There are four in each level. If you collect 
all four, you get a Mountain Dew hotrod. I'll tell you how 
to get them on Las Vegas.

When you enter the strip(road with palm trees in the 
middle)listen for kids yelling, and when you do, look 
for an opening to the right. When you go through, turn 
right and go slowly up a ramp on the building. When you 
are on the roof turn around and go the wrong way and you 
should see a Mountain Dew, so get it!

Go to the Stratosphere Tower (you will hear people yelling) 
and turn right. About 2 seconts later you should see a coppery 
fence to the left and there will be an opening, so go through 
it (Mountain dews 2, 3 and 4 are here).  Go through another 
opening and a Mountain Dew is behind a tree (3 and 4).

Follow step two until you go through the two openings. 
You should pick the taxi because you have to RUSH! If  
you go fast enough you'll jump high and get Mountain 
Dew 3. If you land on the building without blowing up,  
go to the edge and go left. Fall off slowly and you should 
get Mountain Dew number 4.

That's all the Mountain Dews, but try selecting your car 
on the Vegas track and you will find a new car.