My dream ride would be where ever I happen to be on a beautiful day, low traffic, and wide open spaces. I once considered some of the best bicycle rides I've taken and assume that they would work for motorcycles too.
1. The rim of the Grand Canyon - hey on the mc why not go all the way around the main canyon.
2. Kings Canyon - It was a guy on a tw 200 starting out from Sequoia NP campground to do the Kings Canyon on a spring day that convinced me I need to look at a TW. I still want to do that ride with its myriad of curves, lonesome roads on the right day, and deep canyon scenes.
3. Redwoods region. There is something exciting and humbling about being an ant sized body in a staggeringly tall forest. Being on the motorcycle would top it all.
4. Anza-Borrego State Park in southern California. Space, space, space if you pick the right day.
5. Oh you want to play internationally. I'd love to ride the Andes from Ecuador to Chile. I've done most of it on a bus, but on the bike it would be a real ride and adventure.
6. I know a hundred Pacific Islands that it would be good fun to circumnavigate on the bike, stopping to drink a beer, eat some fish, take a swim and talk to the locals. Try Pohnpei in the Federates States, or Palau for starters.
7. Oh, did I forget the Great Smokey mountains and any number of great rides back east where the trees are greener than green and the music, food, and folks justify a stop just about every hour.
I've shown my biases, lets hear yours. Tom