Here is a list I just put together from the interwebs. Kinda generic, but I think there are some pretty neat places here. What kind of a ride they would be would depend on your routing.
You said you wanted ideas...
Mendenhall Glacier Caves, Alaska 58.416792, -134.547195
Antelope Canyon, Arizona 36.862142, -111.374470
Oneonta Gorge, Oregon 45.589806, -122.075395
Skagit Valley Tulip Fields, Washington 48.417939, -122.338162
Maroon Bells-Snowmass Wilderness, Colorado 39.111353, -107.020612
Dry Tortugas National Park, Florida 24.628852, -82.873187
Zion National Park, Utah 37.289971, -113.007021 2012
Watkins Glen State Park, New York 42.370697, -76.894460
Yosemite Valley, California 37.865376, -119.538340 2011
Grand Prismatic Spring, Wyoming 44.526052, -110.838481
Haiku Stairs of Oahu, Hawaii 21.400888, -157.822241
Carlsbad Caverns, New Mexico 32.148114, -104.556768
Whitaker Point, Arkansas 35.890882, -93.440492
Hamilton Pool, Texas 30.342637, -98.127178
Horseshoe Bend, Arizona 36.879545, -111.512420
Northern Lights, Alaska 64.837490, -147.716724
Bryce Canyon, Utah 37.593297, -112.187197 2012
Lake Tahoe, California/Nevada 39.111823, -120.032006
Smoky Mountains, North Carolina/Tennessee 35.612188, -83.549700
Niagara Falls, New York 43.087033, -79.066248
The Wave, Arizona 36.995848, -112.006119
Sequoia National Park, California 36.486613, -118.565720
Thor’s Well, Oregon 44.278596, -124.113536
Badlands National Park, South Dakota 43.855616, -102.339637
Savannah, Georgia 32.083889, -81.103559
Palouse Falls, Washington 46.663836, -118.223622
Glacier National Park, Montana 48.759779, -113.787043
Nā Pali Coast State Park, Hawaii 22.174058, -159.639351
Devils Tower, Wyoming 44.590412, -104.714628