If it's 2 days, then buy the 2 day pass (around $85-$90). It lets you park hop between the parks on the same day. Otherwise, if you wanted to visit 1 park on 1 day, buy the 1 park/1 day pass (around $50). This pass does not allow for park-hopping. If you want to try both parks in one day, try the 2 park/1 day ticket (around $70). You can park hop with this pass.