Try stepping back when your kids complain about feeling bored. This will empower them to think for themselves and learn to be resilient. It will also encourage them to find their own way out of the boredom, and the problem-solving process helps them feel good about themselves.
At your toddlers insistence, you may have read the same book and sung the same song ten times or more in a row. It may seem tedious to you, but there are good reasons why toddlers love repetition and like to hear the same things over and over again.