To dream of a picnic table represents a relaxed or casual attitude about being noticed doing something. It may also reflect your wish to be purposely or intentionally noticed being involved in a behavior or activity. Your intentions or interests on display to others.
Negatively, a picnic bench may be a sign that you don’t think there is anything wrong being noticed acting negative or talking about someone negatively.
Example: A man dreamed of sitting on a picnic bench. In waking life he was very unhappy with his life and was very vocal about wanting to kill himself.
Example 2: A man dreamed of sitting at a picnic table with an old acquaintance from elementary school that he didn’t like. In waking life he was criticizing someone on a website thinking it didn’t matter if the person saw it.