Characters are Treasure Hunters. Greedy dwarves, elvish sprites, and cunning gnomes are in. Hobbits/halflings are out. Lighthearted, even silly tone with a focus on getting the gold/having a good time over in-character roleplaying.
AD&D Spells for MUs. The more variety here the better. Eldritch Weirdness action for NPCs.
Focus on Dungeon Delving. Roman-esque ruins and sprawling cave systems. Traps, running gags, mounds of treasure. Sacrificial chamber's leading into elegant manners, Some deep, if amusing, history. Not too much urban/wilderness action.
Traditional D&D Monsters, but little/still no Tolkien. Kobolds, minotaurs, oozes, lizard men, bugbears are in. Orcs, treants, Tolkien stuff is out. Some Cthulhu but no robots.