Visiting 8 National Parks next spring. Need advice on cool things to do in each!

So my friend and I are graduating college in December and are road tripping the country in celebration. On our way we will visit at least 9 national parks (we love hiking, camping, and just enjoying the great outdoors) we have never been to!

Our stops will be {Smoky Mountains (been here a bunch of times), Badlands, Yellowstone, Glacier, Banff, Jasper, Yosemite, Grand Canyon, Zion, and Arches}

If it helps, we're both thrill seekers and we'll be spending anywhere from 4-6 days in each park for a roundtrip time of about 2.5 months.

If anyone has any tips on trails to hike, places to see, things to do please let me know!

Thanks in advance!