There are a few nice enough/new enough motels at Burley exit on I-84. We're checking on room rates and will post later today.

These are the closest motels in area and only a few miles from the road to Walcott Park. The park is safe and patrolled by county sherriffs.
Like Stephen said, bring meat you want to grill and whatever else. If you don't or can't there will be plenty. I am bringing two 12" Dutch ovens with spuds 'n onions and BBQ pork or chicken. Might get to a peach or apple cobbler. Nobody has gone hungry in the past.

This is close enough to town that I will be at the BBQ, drive home 14mi that night. and be in line for the drive out to the desert. That's my plan anyway. If you plan to stay at one of the motels, it will be about the same distance. There are a couple of restruants for breakfast Sat. morning close by.
Wouldn't be a problem to drive back to motel, get a good night's sleep, grab an early breakfast and be back out at the park in time.
Camping at the park sounds like a blast, but just so everyone knows there are options.

Will post later today with motel info. Come if you can !