Sorry, thought of a few other things. We had tickets for seven days, two at each park except Epcot. Even two days at Magic Kingdom was not enough. There is no need for a Park Hopper pass, because you will never squeeze everything at Magic Kingdom in one day, let alone the other parks. Unlike the other parks, Magic Kingdom has more small rides and kitschy attractions to fill your time (like the It's a Small World, Carousel of Progress, Hall of Presidents, etc.) that have shorter lines but air conditioning and places to sit.
Magic Kingdom opens at 8:00. Get to the property an hour early, park, walk to the gate, and be ready to go before they open. Magic Kingdom has a built-in time waster in that you have to to take either the monorail or riverboat ferry to even pass through the entrance. Even then you have to walk down Main Street USA, another time waster. So at best it might be 9:00 before you board your first ride. That early arrival could net you a 20 minute wait for Space Mountain instead of three hours.
You didn't list of the ages of your party. Late in the day, the families with little kids peter out. That makes it easier to hit the more popular rides. We managed to get on Space Mountain five times in the final hour of the park, and would have gone more if they didn't design the exit so far from the entrance.
You can buy wristbands that have chips in them that act as your ticket. It can be linked to a credit card for purchases, but we used it for the photo pass. The photo pass allows you to scan the wristband at every ride and get photos linked to your account. However, that didn't work well, and my wife spent hours with tech support to identify and save our photos. They really push add-ons like that, but in retrospect we wouldn't have done either.