Let's see now, These are most likely going to sound so you know, clique or plain.
But taking a walk somewhere where there wont be too many people, somewhere you can just look at the scenery and enjoy the walk itself.
As silly as it sounds, concentrate on your breathing and slowing your breathing, actually feel the breaths, breath in deep so you can feel it and so on.
Distractions, Such as fast paced games, movies or youtube videos that'll make you smile, laugh ( silly humour) or just interest you deeply.
Talk with a best friend about gibberish, grab someone you know that will just you know, you can just start up a conversation with and it'll get silly quickly.
exercise in some way or form
OR do what I do and get completely lost on youtube in videos of animals.... mostly birbs 8'')