Joshua Tree Planing Tips?

Going to Joshua tree for my kids 1st Birthday with my wife and Parents. My wife and I have gone a few times on backpacking trips but will be our first more "chill" trip. Looking for suggestions!

Right now thinking we are going to do:

• Key Views

• Hidden Valley Nature Trail

• Cholla Cactus Garden

Only really there for one and a half days.

Additionally looking for ideas for lunch when we first arrive, and dinner outside the park. Staying on the north end of the park. Thanks!