Design the shared part for everyone
A mixed-age outing works when the core activity is comfortable for the person who needs the gentlest pace. Choose one place where you can spend time together, then offer a longer walk or extra activity to those who want it.
A garden-led day, such as Aburi Botanical Gardens, is one option to investigate. Confirm the actual route and facilities rather than assuming a green setting is accessible to every visitor.
Give meals and rests a place
Decide where the group will sit, eat and use toilets before adding entertainment. These aren't small details when children become tired or an older relative needs a break. Ask the venue about the distance from parking to the meeting area.
Keep the first shared activity short enough that nobody has to prove they can continue. A successful stop can end while people still have energy.
Let different people finish differently
One car may leave earlier while another stays for an optional activity. Agree on that possibility before sharing transport costs. Make sure anyone leaving has their own belongings and a clear route home.
The best family plan isn't the one with the most attractions. It is the one where everyone knows what they are joining and can enjoy the shared time without being pushed beyond their comfort.