You can check out available tours by googling - Blue Mountains tours ex Sydney - there are a range of operators advertising there incl all day 4WD tours and there are leads to visitnsw.com which will give a range of options. The Blue Mountains offer a range of things to do the skyrail, the vertical railway,wildlife parks and the scenery. Katoomba is just like any other country town. You want to see the bush.
Hope this helps