Those were a few threads I linked on another thread, do a search, there are a bunch of PD Canyon threads.
The weather from now through May is going to be wildly variable. It may be sunny and 80 during Spring Break, it may be a blizzard. The summer can also be nice, or it can hit 105. In either case, we are a high desert climate, so the nights are almost always cooler, delightfully so in the summer.
Spring Break is a very busy time in PD. And as people learn about CC, it is getting more and more crowded. But then, summer weekends are pretty bad, too.
Both parks are similar terrain. PD is a narrow canyon along the Caprock formation, CC is more along the edge of the Caprock, so instead of cliffs on both sides, the cliff is to the west, with rolling, lower terrain to the east.
If you stay in Canyon, it's an easy 90 minute drive to CC.
CC is a long way from a town of any size. Unless you find a B&B or VRBO, your lodging choices will be the Hotel Turkey or something even further away.
For PD, the hotels here in Canyon are an easy 15 minute drive to the gate, or you can stay further away in Amarillo. You can also find VRBO and other lodging in the Sunday Canyon area nearer the park. For example, kind of pricey, but pretty spectacular:
https://www.dovesrestcabins.com/For CC, about the only thing other than the park is hiking segments of the Rails to Trails connected with the park.
PD, you also have Panhandle Plains Historical Museum, one of the finest regional museums in the United States. Lots of stuff that kids that age would like...cars, guns, dinosaurs, pioneer town.
As far as 2 or 4 days, up to you. Here's a quick list of things in the area, Google them up and see if they appeal:
Restaurants:
Tulia: El Camino
Canyon: Sayakomarns, Pepito's, Imperial Taproom, Palace Coffee
Amarillo: Tyler's BBQ, Tacos Garcia, Coyote Bluff
Umbarger: Rafter G (weekends only)
McClean: Red River Steakhouse
Other Attractions:
Goodnight: Charles Goodnight home and museum (inspiration for
Lonesome Dove)Silverton: Lake Mackenzie (spectacular drive up 207)
Amarillo: Botanical Gardens, Discovery Center, AQHA museum, Air and Space Museum. There's a car museum I haven't been to, Bills Backyard Classics
Plainview: Lllano Estacado an Jimmy Dean Museums
Hale Center: Hale County Farm and Ranch Museum
Lake Meredith: Alibates Flint Quarries, Lake Meredith
Umbarger: Buffalo Lake National Wildlife Refuge
Panhandle: Square House Museum