What I do with my birds (mind you, I have 2) is leave either a radio on or a television set, so he has something to listen to. You could also position his cage close to a window so he can look outside.
If you don't want to get another bird because you are worried about him being less social with you, consider getting a budgie! They can (most likely) stay in the same cage, and they will keep eachother company and happy, but since theyr'e different breeds, they won't bond to eachother as closely as two of the same breed and ignore you!