I've been here twice now (this year and last) on a bus tour and it's a lovely little stop. Very well maintained; clean and tidy.
There's a "Garden heritage exhibition" and "Oriel gallery" but I can't personally comment on those as we didn't visit them; we stayed outside.
The cafe is fairly priced and clean and we were served by a friendly woman.
Said cafe, along with a small visitor shop and such, are modern but are inside the lovely "Clotworthy house".
Site maps are available, for free, inside the visitor shop so might be worth nipping in there first for one, although I don't think you could get too lost here anyway :)
Outside the paths are wide; so plenty of room for wheelchairs, buggies, etc. and most places seem accessible to those too.
Quite a few lovely little gardens and flower arrangements.
Benches are also placed alongside paths.
This year, I saw a couple of people fishing but I have no idea what permissions or such are needed for that.
Dogs are allowed as both this year and last, I saw quite a few people with their dogs.
A decent amount of other people were there while we were visiting, but it wasn't overwhelming nor crowded.
All in all, definitely worth a visit.