We have been to Birr Demesne several times but for this review our last visit was deliberate and with the Grandkids.
Entrance through the main building which houses the museum has you straight into the children's area with the Treehouse (Disney castle style) and other more regular kids playground stuff that kept the youngsters and not so youngsters occupied for about an hour.
Trying to navigate the grounds when the kids have the maps could have been difficult, there are 2 main colour coded walks but several paths so wandering in circles could easily have happened were we not old hands.
Clearly October isn't the best time for flora but the colours of the remaining leaves was a bit special. There were a few trees downed or damaged by the storms and ground staff were busy tidying up. The walking the grounds part added another hour before returning to the entrance building.
The museum is interesting on a number of scientific levels going beyond astronomy and the telescope, chemistry and power generation were other features based and developed from Birr.
Then the Cafe, lots of choice, good food at fair prices. October might be the wrong time but if visiting in Summer the Ice Cream is Good with a capital G.
Visit was 2 1/2 hours. We knew the castle wasn't open although it is on certain dates through the year (check ahead) Pricing is to be fair a bit higher than I would like for parkland gardens but visiting with the family it was well worth the expense.