we did Kadua. , Litchfield Katerine gorge all brilliant , but as other people have mentioned they are very long tours , we did one per day ( BIG MISTAKE ) 6AM start at hotel 8/9 PM return , to early for hotel breakfast , couple of pee breaks on the trip up , maybe a muffin not long enough for 20/30 people to order a coffee, these locations are nowhere near Darwin and you will spend 70/80 % of that time on the coach , with a couple of swimming holes ( they were beautiful ) but by the time you walked down the track , got your swimmers on , one place had no facilities so we got changed out in the open on a rock , then get through the crowd jump in , its time to go , so be prepared with swimmers on already , the commentary along the way was informative , but a tad boring , as there is literally nothing to see along the way ,( flat burnt out vegetation , a few birds and the odd wallaby ( not roos ) so the driver does a good job of commentary about almost nothing , until you arrive at the highlights that are worth the long drive , Now here the kicker people if you do the three locations ,DONT do them separately (14 hour tours each trip) because there is only one highway up there , we saw the same stuff, same commentary, different drivers same blurb , we met a few that took all three but stayed in hotels up there (as they are all in the same region) cost is much the same but you actually can spend more time at the venues without rushing and no coach time , coming back into Darwin at 9 PM is pretty dodgy and nowhere to eat other than a dodgy Maccas. You will thank me if you take the advice they are great locations , long tedious drives