Don't allow your church website to become out-of-date and be hard to navigate. Make sure important facts such as service times/location & directions/what to expect are clear and easy to find.
Have adequate exterior signage that identifies buildings and points a visitor in the right direction. It is ok to make your church look like the bat cave...can't have enough signage.
Make sure your indoor signage is clear and not confusing in which it uses ministry names that a visitor won't understand. Avoid jargon and clever ministry names without explaining what they are/who they are for. For example, don't just post signs for "Discovery Cove" without posting more info about what age group that ministry is for.
Smile, Say Hello & Talk to Visitors! This is everyone's responsibility - not just staff and certain volunteers.