Heir Today, Gone Tomorrow is the 6th and perhaps most popular and well-known entry of the Sierra adventure series King’s Quest. It again features voice acting and large world to explore.
Via Wikipedia :
“The game takes place almost entirely in a fictional kingdom called the Land of the Green Isles. The kingdom comprises several islands, and is described as being largely isolated from the outside world. The player can travel between different islands after obtaining a magic map.
The center of the kingdom is the Isle of the Crown, which has an Arabian Nights theme. The Isle of Wonder is inspired by Alice in Wonderland, and the Isle of the Sacred Mountain is inspired by Classical mythology. The Isle of the Beast is heavily forested and scattered with magical barriers. There also are additional hidden areas. One of these is inhabited by a tribe of druids, while another gives the player the option to confront Death.”