If your father isn’t cacti and succulent lover. He might appreciate you doing his gardens up so they are low maintenance. Less for him to do each week. So he can do what he loves doing instead.
Unless in loves plants then buy him one he hasn’t got for his collection.
The other thing you could do if your dad is an outdoor person then could buy him a succulent plant which could help with sunburn. The Aloe could sit in his favorite spot close at hand for him to use at any time. Or a plant that could bring him good luck or fortune.
Or how about his work area at home or work. Bringing some bright color plants always brightens a room up. They are low maintenance and different types of conditions they can live in you can always find the right one for the area.
A wish all Fathers a happy father day from Australian Desert Blooms on their special day.