You aren't missing anything at all (Bridger to Rockvale). When we in Cody need anything other than what can be found at our local Ace Hardware, Walmart, or Tractor Supply... we have to drive north to Billings, MT... so I drive that route at least once every 6 weeks or so. It's an easy drive or ride, but there's nothing up there worth riding to see.
If you want a ride someplace not in the 4 examples you listed, you might wanna consider a ride south down to Wind River Canyon (about 2 hours)... and if you're really ambitious, continue on south to check out Red Canyon, and/or historic South Pass City. Both beautiful areas, and with high elevation in the Red Canyon & slightly further west area around South Pass City. Check out post #105 in this thread for more info.
And if Uncle John is correct, there's also this option at ~8 hours:
(Couldn't use Google - it won't let the park be route mapped right now.)
Bottom line: we can still make this a great riding event!