if i go today what will be the price for a 12 and 11 year old child

If you have a Costco card you can get the tickets for 25.00 no matter what age

for night splash how much is it a 12 year ols and 11 year old

For guests 48" and taller, the price is $33.99. For guests under 48" the price is $28.99. They go more by height rather than age unless it's a toddler or an infant.

I'm guessing 30 bucks. My 8 year old was 30.