Wow, I didn't think anyone would actually be INTERESTED in how I got there.....

First two boards are point pressed - perfect scores, eating all ghosts, fruits, and dots -- 14,600 after board 1, and 14,800 for board 2, totaling 29,400.
After the first intermission, the maze changes and it's more important to clear dots from the bottom section of the board. I usually clear as much as I can except around the power pellets. Then I start trying to group the ghosts in packs so I can get at least 3 (if not 4) each time I eat a power pellet. Often times I'll keep running through the tunnels on both sides to get them grouped. That pretty much gets me through the peach, pretzel, and apple boards. Although by the time I get to apple, I'm usually more interested in clearing the board than I am at eating ghosts or fruit, since they (the ghosts) start to speed up pretty fast, and it's harder to get them grouped.
Then the 2nd intermission comes, and the board changes again. There's a part of the maze directly below Ms Pac Man that is a trap if you get caught in it, so I always clear that immediately. I also clear the bottom corners right away too, so I don't get trapped there. A picture of my path is shown below. From there the pear and banana boards are what determines whether or not I'll have a good score or a GREAT score. The ghosts stay blue longer on the pear board, so grouping to get all 12,000 on the ghosts is essential on that board. Fruit becomes more important here, going to 2,000 on pear and 5,000 on banana.

The banana board is all about fruit, and clearing the board.
If I get lucky on the first random board and get banana again, I'll easily break 100,000.
Then it's intermission time again. Board changes design again. I've only gotten to boards 10-14 a handful of times, so I don't have any sort of pattern set up for these boards. I'm just trying to navigate as quickly as I can. Furthest board I've gotten to at this point is board 13, I believe - that got me 116,000 and change. Last night I hit 120,000 and died on board 12, so my point pressing is getting better. I also got lucky on random fruit on board 8 and got pears for fruit, so that helped.
My limitations at this point are my joystick (Ultimarc U-stick, which is WAY TOO STIFF) and my reflexes. I'm simply not fast enough to anticipate turns when I get to unfamiliar territory. I'm sure practice will help with that, but I'm not going to get much further until I start playing on a dedicated leaf 4-way stick. My Ms Pac Cab is currently under restoration, so it won't be long.
I know there's tons of books written on the subject and I'm probably not following the 'creed' for this game, but this is what is working for me. Like I said, I play one game a day, on 1 credit. I doubt I'll be calling Twin Galaxies any time soon
