I'm not patient enough to grind for points, but I got myself up to r9 last night, in a couple of hours.
I did both LB and SS, tho, because fighting only undead get waaay too boring. If you can get the "A Show of Force" quest, you get 1600~ LB points and the regular SS ones.
How? **image taken form the wiki entry for the area, lines added by me**
Leave from RoS. Get the Undead Hunt. Talk to Johru (part of Quest). Follow the purple path to the shrine, get the Elemental Hunt. Don't kill the Margonites and Elementals.
Follow the Yellow path (maybe I didn't choose the best color, meh) and take the Margonite Hunt from the shirine there. A bit north of the shrine there is a Margonite group, kill them, they're really close. A bit futher north there is an undead group with a boss, but they're on rock, and luring them away from there so you can kill them with wurms only works once in every few tries. If you're not in a hurry, the extra points are nice, but I rarely bother with it.
Next up is the blue path. This is where having the quest makes a difference. Until you get to the temple, it's all the usual things, including the Undead Boss.
But now the temple has some shrined in it, and when you disable one, a group of Monoliths spawn. From the 5th shrine on, Margonites spawn as well. At the end, 3 Margonite bosses spawn.
Follow the green line once all enemies are slain. Kill all the enemies on your way. Kill the SF ele boss, and get the nice bonus. Mesa's and Stormcrags are elementals, so you'll have a number high enough to get the max boss bonus.
I did this run several times last night, went from r2 LB to r5 relatively fast. Also advanced to r9 Sunspear.
There are 2-5 Locked Chests on the way, so pack Lockpicks. I got three purples out 12 opened chests, and a large amount of golds just from enemies. Also lots of runes, including a Sup Mysticism and a Sup Fire Magic.
I finished each run with a full inventory, with at least 5 items being golds. I wonder how long it will take Anet to nerf wurm runs