Welcome back, JonnieA, I haven't seen you for a while. Nice to have you back on board. :)
I believe it would've been Lothlorien or the Shire. :)
Lothlorien because Tolkien had a strong love for trees, like myself.
Then the Shire, for as Val said it's representation of home and a place of comfort that gave Sam, Frodo, Merry and Pippin a reason to keep on their journey; For the hope of returning home.
But I think, if Tolkien was alive today he would've said that each place in Middle-Earth (maybe even Mordor) had a place in his heart and came from some experience and feeling.
I was born to catch dragons in their dens
And pick flowers
To tell tales and laugh away the morning
To drift and dream like a lazy stream
And walk barefoot across sunshine days.