A multi tip for keeping toddlers entertained, activities varied and toddlers room dust-free:
Keep toys out on shelves. I have 2 sets of 4- high shelves. Instead of letting dust grow on the shelves and the toys, take the toys off, dust the shelves and rotate the toys so the top shelf of toys moves down a shelf every day so the bottom, and most used, shelf is constantly changing. You could group toys into categories (e.g.'work' related, music, creative, caring, cognitive and motor skills) so that you can plan the rest of the day or activities around those toys (so if the stacking stuff is on the bottom shelf then you can have fun stacking other things around the house) and he can hone those skills whilst playing alone with his own toys. He also gets to see you cleaning and will want to help out, which can only be a good thing! (Give him a duster when he wants to help out!)