While a Park-Hopper ticket may seem useful for gaining access to other parks, mainly for a must-do dining reservation that happens to be available on that day, it's actually quite an expensive add-on.
While you might get lucky with a walk-up, don't rely solely on chance—making advanced dining reservations (ADRs) is the way to go.
It's crucial to have high-quality walking shoes and to leave those trendy sandals, heels, and ballet flats that offer zero support back at home.
Staying at Disney World can indeed be quite expensive, especially when you factor in the cost of eating out for every meal.