new to jetboating here,but very familiar with isabella lake,i have property and a trailer with lot and live there off and on,raised on that lake every summer fishin and huntng.its a nice laqke from early morn til bout noon to maybe 2 pm if your lucky,many boats get in trouble when that wind picks up,it very dangerous whitecaps.when lake is low there are trees stickin out towards the back all over,just be careful,gd fishing though.for jetboats id stay close to dam area,have ur fun early and relax the rest day when the wind starts,have seen days with little to no wind,but rare.its a big lake.as for the kern river,be careful tubing,many drownings every year.stay out of the rapids.lots of under current that sucks u under and hold u there,not trying to scre anyone,ive swam that river most my life,just be carefull.especially if u dont know it.my family lives there and im always there,lived there for couple yrs also.so take advice and have fun.its a grat lake for jetskis though,anything that wont sink lol.other boats are fine as well,just jets and flatbottoms dont need to be on it when wind starts.unless u wanna sink it,i dont care how carefull u are,when them whitecaps come over the side of ur boat one after another so fast,there nothing u can do,ive witnessed it many times fishing.other than that,early morn is awesome for boating,smooth as glass.enjoy your trip,take a gold pan kern has alot of flower and small flake gold and its alot of fun to pan and see color.

john c stidman