Ok, I don't have this problem because my kids are grown but I remember it well!
How many boats, barbies, letters, animals, etc. are circling your bath tub right now? Do you have a cute basket to put them in or are they just all around the edge? Organize!
Pick them up. Look at them. Are they old and yucky? Do they need to be thrown out? Have your kids outgrown them?
Are they in good shape but outgrown? Can they be donated?