The Quest for Glory series is fantastic combining the classic adventure game with RPG. Quest for Glory II is my favourite, the last Sierra (or close to it) game to use the keyboard as the main interface before everything switched to point and click. You had to figure out what to "ask about" and "tell about" when interacting with game characters. It immersed you more in the game and made you think of new things to try rather than endlessly clicking through a dialogue tree. AGD interactive has made a VGA version that is free to download. I recommend playing that instead of the original EGA.
