Careful what you wish for. That volcanic rock is very loose and friable at best. Try the Sleeping Giant first, then elsewhere. Definitely stay off those crumbling ridges along the Kalalau Trail. Just my $0.02, but you've been given a heads up. Better to try Iao Needle on Maui.
Lol. I'm wishing for a partner! (As requested). Yes I know all about the rock around the isle. And thank you for the suggestion of the sleeping giant trail, great fun with my 5 yr old daughter. And as far as hiking into Kalalua and milolii from above yes a bit loose and heads up in spots but great adventures. Your $0.02 is great for an average hiker visiting the isle (or others) to takle. So if there is anyone out there that is up for a fun adventure (that yes has risk) just like any bigwall or big mt ascents. I've got 1 parner thats in, getting 1 more to share in the work would be choice. Aloha..