There are parks, even in the city where the air is a bit purer. For our spiritual health we also need fresh air and sunshine. Here we see sun can mean God's word, and it can also mean Christ. We need both if we are to grow. There are many thoughts and admonitions on temperance in the Bible.
Temperance is involved in all phases of our lives.
We can overdo in almost everything. So, whatever we do, work or play, business or pleasure, let us be temperate. Leave that which is bad alone, and don't be greedy with the good. This also applies spiritually. God gave us an example at Creation as Christ did in His life on earth.