Hi I'm running out of activities to occupy my 5 month old... Anyone has suggestions? He is very active and demanding of my attention...

Good thing that he is very active. But when he is very active, he shouldn't be demanding more attention from you. It seems that he is not occupied more by himself. Train him those wooden puzzles or stacking cups. It will keep him occupied for longer times. Give him those musical guitar or piano toys - sounds and lights attract him for longer time. And forget not, when he is such active in such games, he will get tired soon and will need feedings frequently and sleeps more. And finally you get some time for yourself.