i usually go from eldevin (after doing the ones next to mage place) east gate, bit north to ne corner of city then east to adera lumberjack camp, heading south cutting trees (yes you will have to fight some spiders) then to the west wall of fort brigade (what ever its called) where theres a big bunch, then west back over the tree to repeat the route, cutting anything in sight. Seems like a pain, but i never run out of trees that way and i have found its faster than waiting. Also, dailys are good, but they really get good lvl 10+ when its 500xp for lvl 10 daily. The lvl 1/5 dailys are worth doing also solely because your bound to have left over logs without enough sap.
If your going to buy sap to cover left over logs, try and get off players for 3-4 silver each, will add up in the long run compared to buying off the dude at eldevin market who sells for 5s each.