It is pouring here in Rafter J right now.
KC and I have the same sentiment but that said you've got an awesome hike ahead, lets see if we can make your recovery day as good as it can be.
Seeing the sites means different things to all of us. Like Yellowstone and other adjacent public lands the greatest of Grand Teton is rarely on a roadside. The most popular hike in GTNP is Wyoming's most popular hiking trail, Jenny Lake up Cascade Canyon with the boat shuttle, after the 20 minute ride across the lake you can as far or near as you want but you're gettin' ready for a big hike, I'd blow off the boat and go from String Lake Trailhead do 5 roundtrip miles or whatever you want. Leave tourists behind and add a little side trip to the Ribbon Cascade. Maybe hike Leigh Lake instead, maybe go rock/cliff [20+'] diving after a short hike in from the preserve on Phelps Lake; there is an incredibly extensive bounty of spectacular greatness.
That said I don't believe Cascade is the most beautiful or spectacular Teton Canyon and would recommend a short hike almost anywhere. Maybe you want to hike Taggart and Bradley Lakes, even my fat posterior makes that a pretty easy 3 hours. Maybe you should get a canoe and spend a lazy day on Leigh Lake. If it's really hot maybe hike and mess with your reproductive prospects in the likely unaccompanied cold Waters of Laurel Lake, perhaps the smallest Lake you will ever go to, find exquisite hot springs outside GTNP boundaries....Just have a blast.
If you just want to drive into the park I'd simply suggest just getting out for at least a mile or two anywhere up and down the range from the Rockefeller Preserve to the Rockefeller Parkway, get ready, acclimate...or stay in Jackson, get incredibly drunk, ride the tram up top and get drunker, and then be dehydrated your whole hike.
Whatever you do thanks for your contributions to our economy and may it be among the best of hikes.