Well, besides Lego Island, I played a lot of Freddie Fish as a kid. Humongous Entertainment was pretty good with their point and click adventure games. The Learning Company made some really fun games, like treasure mountain. Those made indoor recess so much more tolerable in school. Finally, jump start was the last company I can remember.
Also, I heard of Oregon trail and where is Carmen Sandiego were good games back in the day, though, I never played them.