Do they combine a Park admission and a Slash park together for the day?

If you plan on going to one or both parks more than 2 times a season pass is a better value since you get free parking and 20% off anything you buy there-food souvenirs etc

Yes for additional cost

$79.95 for both combined...per person.

Each park cost separate but you can buy a ticket for both parks at a discount.

You can choice to get both passes for the day but not to certain if they have a day pass for both parks

Cost more