I've been riding the new Sea Otter XC course the last few weeks and I advise anyone who is gonna ride the beast to get down here to pre-ride the course a bunch. And bring your climbing legs. There is one very tuff climb (BLM Trail #82) at about the end of the first 1/3 of the course that is really eye opening. The 3 Sisters are done backward after climbing up Pilarcitos to Skyline to Outhouse Trail. The last 1/3 of the course from the bottom of Engineer Rd./Jack's Peak Rd. junction all the way back up to Laguna Seca is at least a 20 minute grinding climb coming at the end of all the single track climbing that came before. There's undoubtedly gonna be some really tired and demoralized ppl on this ride. Did I mention the 2 sand pit descents (trails 60 and 35)? The carnage in there is gonna be fun.