I recently read that this game was released 25 years ago and knew I had to play it again (Amiga version of course!). Playing it again I had an idea for a puzzle cache!
You are looking for a ten letter string of numbers. Use the letters found at positions 8 and 9 (there is a technical reason for that).
All the co-ordinates are FUN!
The cache is located at N50 4A.BCD W000 3E.F0G
A=HC
B=JC
C=IC
D=CC
E=EC
F=GC
G=CC
Suggest you don't do this as a park and grab as the road is very busy and the parking wardens are very active here. You are probably better off parking at the end of the road where there is a very small section of half hour parking and taking a short walk to the cache. If you come in the winter season or before 8am / after 8pm the parking restrictions don't apply and you should have no problem finding a space. Great place to walk the dog.