The peace you feel in the nature, is the peace around you, NOT within you. Please understand this. It is very important. The peace you feel up there is very blissful because its a new experience. It is very temporary and it will be lost very soon and it is of no real significance. You will only get an illusion that you are peaceful for some time. After coming back, you'll be back to exactly where you were when you left. Take a moment and think about this from your own experience.
Get out of the illusion that a trip to the mountains, the beach or the jungle will cure your problems and bring you peace. Temporarily yes. If you are ok with that, all the best.
External environment cannot bring inner peace. External environment cannot take away your inner peace, only if you bring a little silence within you consciously and start seeing things clearly. This is the only permanent solution. Rest everything is superficial talks.