Of all the ages, realms, kingdoms, etc...

oh snap! Great question! For me there are several choices:

1. Doriath: I would love to see the realm of Thingol.
2. Menegroth: Tolkien's description alone would tempt you
3. Alqualonde: we all love a vacation at the beach, let alone the shores of Aman xD
4. Gondolin: To look upon the seven gates of Gondolin is something not to be missed !

For me it would've been Khazad-Dum before its fall. Love the dwarfs.

Oh gosh, the amount of places....
To live:
1) Alqualonde: Beaches, Undying land, Mountains behind
2) The Shire, South Farthing: I would prefer around a century or two before Bilbo was born. No doubt, I would be cultivating and breeding Old Toby as we know it today.
3) Hyarnustar, Numenor. Particularly before Tar-Minyatur's reign. I would dwell in the south-western region, where they had an affinity for wine-making. Preferably somewhere along the Bay of Eldanna.
4) In-between the river Narog and the coast, south of Taur-en-Faroth.

To visit:
1) Menegroth
2) Tol Erresea
3) Valmar
4) Khazad-dum
5) Gondolin
6) Angband/Utumno (after the war of wrath )
7) Thangorodrim (after the war of wratch)
8) Tuna/Tirion
9) Armenelos
10) Many others...

In the 1st Age, I always had a fascination with Dorthonion, mainly because of my days spent hiking the high country of Washington ad Oregon, and seeing the undisturbed groves ofMilleniel-Aged Douglas Firs, Cedars, and Western Hemlocks. I would stand with the men of Beor and go down fighting.

In the 2nd Age, and in contrast to my 1st Age fascination, I'd like to be a Numenoreon Mariner who settles in the west of Middle Earth. The building of the big ships from the forests of Dunland would be something to see, but I would advocate against the complete clearcutting the Numenoreons did in Middle Earth.

In the 3rd Age, I'd live in the Hills of Evendim, a Dunedain soldier of Arnor that was somewhat of a hermit. I would fish Evendim Lake, and go tot Annuminas for the times I wanted to enjoy the company of others, and would go off to war against Angmar.

Valinor sitting at the feet of Manwe as Ingwe did sounds pretty awesome to me. Or there is this detailed description of Gondolin in the Unfinished Tales of Númenor and Middle-earth that states it had seven gates, made of greater and greater metals, which really struck me.

The years of the trees in Valinor, if that is alright?

“The one had leaves of dark green tear beneath were a shining silver, and from each of his flowers a dew of silver light was ever falling, and the earth beneath was dappled with the shadows of his fluttering leaves.”

Beautiful, isn’t it?

“The other bore leaves of a young green like the new opened beech; their edges were of glittering gold. Flowers swung upon her branches in clusters of yellow flame, formed each to a glowing horn that spilled a golden rain upon the ground; and from the blossom of the tree there came forth warmth and a great light.”

Truly, utterly, ethereally beautiful.

But then bearing the loss of it?

"Varda looked down from Taniquetil, and beheld the Shadow soaring up in sudden towers of gloom; Valmar had foundered in a deep sea of night. Soon the Holy Mountains stood alone, a last island in a world that was drowned. Alls song ceased. There was silence in Valinor, and no soundc could be heard, save only from afar there came on the windt through the pass of the mountains the wailing of the Teleril like the cold cry of gulls. For it blew chill from the East int that hour, and the vast shadows of the sea were rolled
against the walls of the shore."

Sometimes I think of the burdens the elves carried, who loved and cherished beauty above all, and stood witness to the loss of it again and again for thousands of years ans it makes me realize that they really deserved to rest in Valinor.