There is no easy way to see someone you love in a hospice. you just have to bite the bullet and see him/her. Write a note you have to. Stay as long as you are comfortable with.
Being jolly, is difficult. Maybe be respectful. If they want to shoot the breeze then maybe but you may find a person who is incapable of speech and opening their eyes. You may have to talk and hold hands and that is about it. It will be tremendously difficult.
I would strongly recommend writing down all the things that you want to say because it is difficult situation to deal with let alone talk through.