Yes, Gulf Stream has factory tours daily. I don't remember the times but you can call them and ask. We have taken it four times now.
As far as factory service again you will have to contact them. Not sure of their procedure as far as factory repairs at the present. They do have some excellent techs there. We had factory repairs done on our previous GS coach by appointment and at the Back Home rally this past June.
They have a small 13 site camp with electric and water hookup. A dump station is just a few hundred feet up the road to dump your tanks.
There is also a golf course at the factory that you can use and a day room when your coach is being worked on.