What level are you aiming to get a high score at?
If its a low level (noble or below), play a philosophical leader and farm everything, grow your cities as much as you can, employ plenty of specialists, put cities anywhere they will fit, lightbulb techs and build every wonder in the game, take over the world and you should get a decent score. You also have to try and win early (domination before 1400AD is a good aim).
Essentially of the four components of score, land is going to be the same regardless if you're aiming at domination but you can aim to maximize tech score, wonders score and population score.
Hope this makes sense and helps!