Thanks to everyone for all the info.
To anyone who'e been there, how does this plan sound?.............I will get to Page area mid morning...........try Upper Antelope, then head to Horseshoe in the later afternoon to do sunset there. Next am, Lower Antelope, then I have to leave. Sound like a good idea? How is lower in the afternoon?
Sounds like you don't need a guide for Lower, but anybody have any specific "guide" for Upper if I get a chance? Lots of internet opinion out there, but anybody here have any striong feelings of which one is best? Sounds like Upper is going to be crowded and frustrasting no matter what, but if i can try it I will, but it sounds like i will be a lot happier in Lower.
Also, how much travel time is involved in getting to these sites from Page itself? Doesn't look too bad, but again I have not been there.
Since this is a family trip, most of my gear can't come. So I was planning on bringing a 5d3 body, 16-35L and a tripod. As mentioned in above, it sounds like its dark. Is using a tripod an issue due to people, or just no room to set up, and is this as much an issue in Lower Antelope? IS would be good, but the 24-105 may not be wide enough to do it all.
Last question........is the dust really that bad? A friend said it was raining sand when he was in there; if so, i was thinking about renting rather than bringing my own stuff.
Thanks to everyone for all you opinions and help; learned a lot already!!