Hi Robert,
I lived in slc during the late 90's and early 00's and traveled tons that area in my 79. I never stayed in the parks themselves - way too expensive and too many portable generators in  he big rv's for my liking...
What I did was free camp in the blm lands adjacent. 
I practiced a Leave No Trace policy and planned accordingly (i.e.: lots of extra water and an extra spare).
I wouldn't trade those trying or for anything.
I say wing it!
Jvk

Sent from my mobile

> On Mar 25, 2016, at 11:32 AM, Robert Clemmer <n51219@COMCAST.NET> wrote:
> 
> Your experience please.
> 
> 
> 
> The last week of April and the first week of May my wife and I will be
> visiting the National Parks of southern Utah.  We have no agenda, just a map
> and time. From your experience, will it be necessary to make reservations
> for lodging in advance, or will it be safe to "wing it" as we go along.
> 
> 
> 
> Thanks or your input.
> 
> 
> 
> Bob & Bonnie Clemmer