Listening to Celtic music
Any time I go camping, hiking or taking long walks in nature, a beautiful scenery, be it mountain, hill or plain.
Flowers.
The sea - the sound of the waves at night time, when the beach is relatively quiet.
Clear summer nights, when the air is fresh and it's so quiet, and eveything is suddenly so
clear , you can hear yourself breathing - it makes me feel like I'm one of the First Elves awaking under the stars.
Also, because the first time I read LOTR was around Easter, in the springtime; the coming of spring reminds me of Middle Earth.
Oh - and the smell of popcorn reminds me of the agonizing wait in movie theatres during the opening nights of a Lotr movie...and not only the opening nights. That should tell you how often I go to the cinema, lol.