From my game experience:
*Coins- bronze coins are worth 1 point, silver coins 3, gold 5 and flying gold 7. all coins count the same towards the treasure bonus, so collecting gold coins won't get you there faster.
*Runners- the one which doubles the treasure time is the best to score points. Not only the treasure time is double, you can collect more coins there. it is about X3 more coins per treasure.
*Bonus- runners' bonuses are accumulative. If you upgrade Kimi you will get that bonus for all the other runners as well. It means that you have no reason to spend money on upgrading the good runners before completing the upgrades of the cheaper ones.
*Daily Bonus- there is a bug in the daily bonus. If you don't complete the mission on your first run you will not get the daily bonus. There is a way to avoid it- if you force close the game after every run (or just before the run you succeed in) you will get that bonus.
Cheers