That feeling of accomplishing something, the feeling when someone better than you tells you that you did well!
When your boss says thankyou and he's impressed
That first sip of an ice cold cider after a days riding on a hot day with mates.
Thats feeling of meeting a new girl and it feeling like you have know them ages, being all relaxed around each other.
Watching a real nice sunset or sunrise, or just seeing a view thay stops you in your tracks for a slight second and makes you forget everything
When a song that you forgot about but used to love comes on and makes you smile! Or a song that comes on and has relation to a current situation, always makes my hairs stand on end that!