I am teaching English to some Japanese families.
For the adult learners, I made a simple board game with a little of a RPG element. They have little experience of fantasy or board games- they didn't know monopoly. I teach them twice a month. My material expense -fortunately I have a lot of books and other materials from Australia.
Basically I found this
http://670.wikispaces.com/RPG-ESL-Game-DesignDocument where they didn't complete the game and I used the map shown. I just had the students move their token around the map. Using cards, they can solve, using unique descriptive words, challenges such pass by a large "mouse trap" trap, a checkpoint, a spider, a chest. Also solve one word jumbles. And finally at the individual destinations- aerie, mountain, cave, shipwreck- they need to verbally describe how to get to point.
Now I thinking that I will make a role-playing game with descriptive solutions to problems. My first thought is a linear game where they fall into a underground maze with a pack that is Dungeoneering Kit (Pathfinder) plus a fisherman hook and they have to solve problems like get over a pit, climb a cliff, use pulleys to raise a slippery sharp tree. More ideas wanted please? Is there an adventure with all descriptive solutions to little situations or a way to be not so linear?
I am trying to avoid fantasy words (unless it used commonly too) as it enough effort teaching all the words to that will need before it. I'd like to use game with the children that I teach (one family I meet twice a month and the other is generally once a week) but who will need even more support.