Rather than doing a standard tour for around $100, we chose to venture out to Katoomba ourselves and walk wherever the day took us.
The train left around 8.15am and cost us a whopping $17.90 return! (Thank god, I'd already bought far too much crap!)
Now doing this, we did realise we missed out on a lot. There are caves and waterfalls that are far more easily reached with a lift! But there is also the option of the Hop On Hop Off Blue Mountains Explorer bus - a whole day pass costs $40 and you can get to almost any location you would want on a day tour.
Still the Three Sisters and this wondrously stunning view though!