In reply to Jones_88: Hi Wyn,
I have the previous guide which I am willing to loan if you like. It would do you just fine as the new guide is very little different on the routes you are likely to be doing. It's also smaller so easier to carry with you on routes.
Three weeks should be a great spell to have there. If you're steady on VS trad you'll have a great time there. All the advice above is good (except you need to be competent on HVS in my opinion to do Watchtower Crack; I was lucky enough to be able to borrow an enormous cam which I kept moving up the crack with me).
Some things to whet your appetite:
Everyone does their first route on the Organ Pipes - do the same!
Muldoon - one of the best routes ever at about HS/MVS.
Eskimo Nell - a great easier route
Bard - lives up to all the hype - great steady climbing after the slightly worrying start.
Resignation - a VS through E1 terrain.
Lamplighter - the world's best VS (see UKC article of mine). This would be my absolute must-do route at the grade.
Siren - another great severe
Arachnus - unbelievable for the grade but take a rack of cams for the big horizontal breaks towards the top.
Lots of the 12 - 15 grade routes on Watchtower Faces are really great. Hot Flap is my favourite
If you're going well and can access a double rack of cams have a go at Brolga. It's really just sustained 5a and E1 without enough cams!
Don't imagine that the one and two star routes aren't good - most would be three stars in UK. One of the best of all the severe-ish routes I've done there is Beau Geste, only given two stars. Also, Dune, next to Eskimo Nell is a brilliant outing though only one star, and Xena, next to Siren, is at least as good but only one star.
My advice would be not to just go for the higher grades as many of the best days you'll have will be on long easy routes like Hurricane Cracks. I haven't done Tiptoe Ridge yet as I'm saving it for my dotage.
On the gear front I'd say two 50m half-ropes are ideal. Otherwise a standard UK style rack is fine and cams are pretty useful. Although RPs were designed for Arapiles rock you'll barely use them on routes up to 18 so I'd not bother unless you already have them.
If you trawl through some of the above routes on UKC database you'll find photos and some maybe half-decent beta if that's what you want.
You don't say if you're going with a partner, but there are always people as the Pines (camp site) looking for partners.
Have a great trip - just possible we might be there at the same time, so look out for a hobbling old git with a grey beard and good-looking wife.