Went last year, it was 20 dollars per person, the carts hold up to 4 people... This year they added a 10 dollar parking fee. ( which I think is BS, if they wanted more money, increase the rate to 25... Don't charge me to park for a 1- 1 1/2 hour attraction..
If you do go, drive slow take your time, look at all the sites.. I did enjoy it.
We then went up to the TOTR clubhouse, checked out the restataunts (a little pricey), the museum which was not open yet, and just a general look around..