Was just going to mention Summerlee. Great wee museum- big machinery indoors, lots of history, foundations of an old foundry that gives you an idea of the scale of it, short tram rides, a small pit that you can go down into, a section of the old coatbridge canal still there to walk along.. Aye, ive been a few times with my boy. He loves it and I still do too..
Transport museum is good as well and also has Hms Glenlee beside it which is good for a good few hours if its a rotten day.