Camping with a 20 month old

We recently booked a trip to Yosemite with some friends of ours.  Charleigh will be 2 years old, and mama will be about 35 weeks pregnant (Crazy?...just a little) Ha.  This could be fun...

Actually, the other two couples who will be joining us...they are also pregnant! (the poor husbands)

Anywho-we are wanting to do a camping trip or two before July.  Call it a test run if you will.  I was wondering if any of you out there have any camping advice with little ones? Or any products that you HAD to have!?

I will post a follow up after our first camp-out, posting my own must haves....and talking about the experience.  Crossing my fingers that little miss Char sleeps!! :)

This view will make it all worth it...right? 

;)