Hi, you can see the main falls without a lot of walking, but from the start it's all uphill. Downhill back! It's around 1.5 kilometers to main viewpoint at Corra LInn - that's probably just over a mile at a guess - and that's the bigger one - but only a short walk to the lower less spectacular falls. They are still nice but not spectacular. You can go back the way you came if you have small kids, and judge how much time you need. There are a few viewing points you can access and it's a nice walk, I've done it with my 8-year old, no problem. If you go in summer it's less likely you'll see the falcons - leaf cover. (I've never seen them anyway!) If you go in autumn it's colourful and there are lots of fungi. There are rangers there who can assist - they have a hide for peregrine watching, and badger or bat watching trips at night - and we did pond dipping with them. You need to go on their website which Trip Advisor don't allow me to name. There is a "Glasgow, Clyde Valley and Arran" walks book published by Jarrold that gives you a map - see walk number 5 - but you don't really need a map, just follow the well-defined path up beside the river. I've done it around 4 or 5 times, it's always pleasant, and fun for kids if you watch out for wildlife plants and fungi, etc. Have fun! If you hike back up the hill to Lanark itself there are some family friendly pubs and restaurants, like the Clydesdale Inn. I wasn't too impressed with the cafe at the Visitor Centre, it's Ok but nothing to write home about, very ordinary. Hope this helps.