Right after Eye of the Needle is a runnout rapid (Lucifer's) that I've seen a lot of carnage in- be mindful that there are very chunky pourovers along the right channel that could swim a complacent boater into many, many rocks. The clean line / sneak is in the right channel, up against the right side of the rock island (left of center in the right channel). Once past the island, it's read-and-run center.
There's a better write-up than on AW.org / Eddyflower (no offense, Paul) found here: http://southwestpaddler.com/docs/sanjuan3.html
One thing to add- keep an eye out for the Hot Springs on your left before the pack bridge- it's a nice stop to warm your feet.