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Give them choices -- do you take the easy way or the hard way? Repeatedly...
If they do X to get away, they succeed easily but enemies get closer, or they have to fight someone else ("the easy way is always mined!"). Or they can try the hard way -- if they succeed, the enemies fall further behind or are weakened.
Quicksand patch -- with a Survival check, the PCs can leave traces indicating that they entered here, and 3 pursuers have to make Reflex saves (DC 14) or be trapped in quicksand and out of the pursuit (maybe dead, won't matter). Or they can just go around -- but then the tribesmen get to go around too.
Up ahead looks like the lair of (insert local ferocious beast) -- can you get past him with a Stealth check, or do you go around? Maybe the tribesmen won't puruse, or will wake him up (and lose 1-3 from the pursuit.)
When in doubt, have some drums sounding way behind the PCs.
This looks like a good ambush site -- do you try to lay one? (Be dramatic, e.g., a trail on the edge of a cliff.) If the PCs lay an ambush, they have to fight 1-2 enemy scouts (the enemy has split up to cover the possible escape routes); if they can kill the scouts without them raising an alarm, they gain hours -- if they don't, all the enemies converge on the spot.