Step 1: Round the whole place for girls first.
Step 2: After satisfied 'wash eyes', finish nose-bleed and getting cool down from the 'heat', then go another round for the cars.
Step 3: While admiring the cars, can repeat Step 1, especially when eyes getting tired.
Step 4: If possible, repeat Step 1.
Step 5: Go home. Can proceed to toilet if required.
Think can spend the whole day there if you follow the above instructions.