I personally hope there is another Shire they go to where their big brothers (Men) are not allowed to go (except for perhaps you and me Eldo!) Indeed, it would be the world of The Hobbit where LotR did not exist, and while Gondolin and Nargothrond existed (in the past) the Silmarillion didn't. In this Heaven, little Hobbit lads and lasses could go off on all sorts of exciting adventures, anything from climbing trees, to out-witting dragons, to finding magic rings, to even sneaking around the Necromancer's lair in Mirkwood (this Necromancer bad with evilness, but Fairy-tale evil, not overborne and weighed down with Sin and any associated Judean-Christian Religioevil).
Imagine the seedcakes and birthday presents, and all that high adventure with goblins, and stone giants, and soaring eagles (and even Men, in their place), and at the end of day, a safe Shire to come home to! Tom Bombadillo and Treebeard and Barrow-wights would be there too, for they belong in a Hobbit Heaven and make no mistake!)