I hiked the Iron, Roundtop, Granite, Rabbit loop counterclockwise from Monte Cristo campground. This is the highest of the four peaks and has a number of rocky outcroppings and pine trees that give it a higher elevation feel. After 10 minutes of searching, I finally found the register very well hidden underneath a big, slanty boulder. This register was way too hard to find; there were only three entries since 2014 and I know there's been more visitors than that. There were some Coulter Pines with their giant pinecones just below the summit.