Dreams involving water often symbolize emotions and the subconscious mind. In your dream, being in the woods and near a lake suggests a desire for adventure and exploration of your feelings. The act of wanting to go swimming, especially without a swimsuit, may indicate a longing for freedom and a release from societal norms or restrictions.

Skinny dipping can represent vulnerability and a willingness to embrace your true self in front of others. Your guy friend's decision to join you might suggest a level of trust and comfort in your relationship with him, indicating that you feel safe being open and authentic around him.

Consider reflecting on your current feelings about this friendship and whether there are any underlying emotions or desires you might want to explore further. This dream could be encouraging you to embrace your true self and possibly deepen your connection with this person.