Disney's park tickets are priced so that the "longer you play, the less it is per day." In many cases you can almost save money by staying for a longer vacation time. In addition to the following base ticket prices you also have extra options such as - No Expiration, Water Parks Fun and More, and the Park Hopper.

Magic Your Way Base Ticket
(one theme park per day, includes tax)

Adult (ages 10 and up)
1 day -$90.53
2 days -$178.92
3 days - $247.08 
4 days -$258.80
5 days -$267.32
6 days -$275.84
7 days -$284.36 
8 days -$292.88
9 days -$301.40 
10 days -$309.02

Child (ages 3-9)
1 day -$84.14
2 days -$165.08
3 days -$227.91
4 days -$238.56
5 days- $247.08
6 days -$255.60
7 days -$264.12
8 days -$272.64
9 days -$281.16
10 days -$289.68

Add on the Park Hopper Option or Water Park Fun and More Option to any base ticket for $58.58 EACH with tax.
**To add on the Park Hopper Option to a 1-day base ticket it's a flat fee of $35 ($37.28 with tax)