Descent: for the rappel, a single 70m rope works just fine with the new 2 bolt rap station just before the overhang (you'll see it), and probably cuts down a lot on risk of the rope getting stuck with a double rope rap. Camping: lower geraldine lake is the spot to do it, although you can probably get away with camping at upper geraldine to save some up/down (probably a wash honestly). If you do opt for the lower one like we did, do yourself a favor and check out other camp site on the N side of the lake (way nicer than the S side). Approach to camp: from crown valley trailhead the trail is indeed dusty, but is not hard to follow, at least for the first 5-6 miles until you pass Spanish lake/little spanish lake. At that point the trail will start veering north for some reason and you will want to ditch it. Go cross country east, just north of a lake (? name), then once past E/SE to a gully. Follow this gully up to the pass; the trail is gone gone gone, but it's easy to just walk up the slabs on your right the whole way. Once at the top of this pass, if heading to lower geraldine don't go right!!! Instead go straight left trending with an isocline, hugging the left side of this wide gully, going gradually downhill, til eventually this becomes the slabs making up the west side of lower geraldine lake. If you do the above it will knock off at least 1 mile and much walking VS following the elusive "trail" that takes a much more circuitious route to the lake. Camp here, or alternatively you can proceed onwards to the base of the obelisk where at time of writing there are several spings running replete with water. If you follow the above and don't get lost, it's very realistic to make it to camp in under 4 hours (on the way home we made it out in 3 hours but that is mostly downhill). Approach from camp to obelisk: from lower geraldine lake, go to the east side of the lake where you will see a sign on a tree that says "obelisk", pointing SE up the gully. The trail is long gone in parts, so you can safely ignore it and just walk up this gully following the slabs on the right side when ascending. Once you get to the saddle you will see the obelisk to your left in the distance. My experience was that the lower routes (handle with care, west face) require bushwhacking no matter what you do, so save yourself the mileage and follow the gully directly to the base of the climb. There is some bushwhacking at the very end, but it's otherwise clear. To avoid carrying your crap up and down extra, you can leave your pack like half way down the gully and pick it up after you come down from the NE rap stations (these dump you out much higher than the base of the above climbs, at the obvious notch on the N side of the obelisk). Takes roughly 1 hour.