I personally would not go without the park hopper. As mentioned above, some parks close earlier than others and if you aren't ready to head back to the hotel you can go to another one. Or if you've been at a park and are just plain sick of it, if it's too crowded, or if you just want to ride a certain ride from another park, you always have that option.. Sometimes a certain park is much more crowded one day due to parades.. If that happened, you could just go right on to the next one and save yourself a stressful, crowded day! Just my opinion, but then, to each his own!