Naoshima Day trip from Okayama

We are still in the planning stages of our deferred trip (7 th trip for us!)
Thinking of a day trip only to Naoshima from Okayama.
There will be 4 adults, all in our 70's: would it be possible to have a taxi/private driver for the day so we could guarantee going to all the Art places? If so, how would we organise that?
Could a Tourist office do it for us if it was possible?
The whole "one bus an hour" thing has a bit worried!!
Many thanks

https://naoshima.net/en/access/access_from/

According to this site, there are only two taxies in Naoshima island so you need to book beforehand. You might be able to contact with e-mail shown in the bottom of the page.

Our experience (been 3 times) is that it's not so bad for transport.

Each time we've visited, there's always been a bus at the port when the ferry arrives, and if you arrive fairly early and go straight to the Art House sites in Honmura, you can do all of those and then use the Benesse shuttle to get to the bigger museums.

For me, I'd say that trying to do it all in one day might be a challenge - even if you had your own transport - but we all travel at different paces.

The one bus per hour is a bit of a hinderance, but you only need that between the main areas. For the Art House Project you would probably be walking between those sites and at least one is not accessible by taxi anyway. Take note of the timetable as you will need to work around that for you ferry connections anyway.