Route to Joshua Tree

[jimocon]

Hi Everyone! Jim and I are in Southern CA (Hisperia, I-15 mm 147)
headed further south. Has anyone taken their bird on hwy 18 to hwy
247 to Joshua Tree Natl Park? Is it narrow, hilly, treacherous or any
of those things that make the navigator nervous?

We're thinking of a few days in Black Rock or Indian Cove, then hwy 62
to Palm Springs.

Your comments please. Better to plan ahead based on your experiences
than learn for ourselves on the fly.

Thanks in advance

Pen & Jim
'83 PT 35
Hisperia CA