Is it actually possible to have fun in Orlando without Disney?

Yes. Orlando has a massive local culture revolving around lakes, springs, and independent neighborhoods that theme park tourists rarely see.

How do we get around without a rental car?

It is difficult. Orlando is sprawling. You should budget for a rental car for the duration of your stay to visit the springs and parks outside the city center.

Experiencing Orlando with the Whole Family Beyond the Theme Parks

To enjoy Orlando with a multi-generational group without hitting the major parks, focus on the natural springs, the historic neighborhoods, and the extensive public park system. Prioritize mid-morning departures to avoid the theme park traffic rushes and choose activities with varied physical activity levels to keep everyone engaged.

Rent a central house with a pool. Avoid tiny hotel rooms. Look for vacation rentals in Winter Park or Kissimmee. A private pool is the single most effective way to keep kids occupied while grandparents relax, without the expense or stress of a water park.
Head to the natural springs. Drive 45 minutes north to Kelly Park/Rock Springs or Blue Spring State Park. Arrive by 8:00 AM to get a spot. The water is a constant 72 degrees, accessible for swimming, and the boardwalks are stroller and wheelchair-friendly for older family members.
Explore the Winter Park chain of lakes. Take the Winter Park Scenic Boat Tour. It lasts 1 hour and provides a relaxing, seated view of the local canals and mansions. It is gentle enough for all ages and requires zero physical exertion.
Visit the Harry P. Leu Gardens. Spend a morning walking the 50 acres of gardens. The paths are paved, providing easy access for those with mobility issues, and the sheer amount of shade keeps it cooler than the open concrete of the theme parks.
Eat in the Mills 50 district. Skip the 'tourist menus' on International Drive. Head to Mills 50 for authentic local dining options that are cheaper and higher quality, giving the family a real taste of Orlando's diverse culture.

Is it actually possible to have fun in Orlando without Disney?: Yes. Orlando has a massive local culture revolving around lakes, springs, and independent neighborhoods that theme park tourists rarely see.
How do we get around without a rental car?: It is difficult. Orlando is sprawling. You should budget for a rental car for the duration of your stay to visit the springs and parks outside the city center.