Try not to mix any unpleasing sadness to your thoughts. Remember the events that soothed or elevated your mind.  This way you can keep your mind in a happy state.  Keep it open for fresh thoughts to enter.  allow the mind to absorb spiritual thoughts of truth, grandeur, beauty, love, hope, faith etc. Enjoy every bit of the environment.  Think with your intellect what best you can do at any given moment. Keep your mind cool, free of tension, fear, anxiety, doubt and despise.