We will be there April 19 through 26 and I know it will be about 85 during the day and 65 at night. Should I pack jeans and jackets for at night? Will it be cool out at all like in the mornings and late evenings? Anything would be helpful! I want to start packing now 

Also, there are lockers at the parks that you can rent for the day to store stuff in so you won't have to carry alot. Have a wonderful trip.