Things to do....

Smile.
Be enthusiastic.
Make eye contact.
Remember peoples names.
Be nice about other people.
Help out.
Let it go.
Ask questions.......ask people how they are and what do they think. I was out shopping recently with a participant who is in a wheelchair. Somebody they hadnt seen for a while stopped to say hello.....they then looked down at the wheelchair and said " no need for me to ask how you are then?"