Scavenger Hunt

I didn't love this one, but I didn't hate it either!
Here are my notes:
This image, “...the insects and the weather had gotten to him by the time a ranger stumbled across his fleshless finger, pointing through the sun-baked mud at the blazing sky” (pg 16)
She was a big brunette, on the gray side of forty. (pg 67)

Christopher Pike meets H.P. Lovecraft
The ridiculous amount of planning that went into the creation and running of this scavenger hunt and no one thought to pack shovels?

I'm confused as to how the land lizards relate to the Lizard Ancients. Is that what's in the pool? What's up with the acid?
Is there a sequel?