You could trim the split ends yourself, but do it carefully and in front of a mirror. Get a friend to do the back of your head, and don't cut off too much hair. Remember; you can always cut off more if you have to, but you can't stick your hair back on if you cut off too much.
Also, I never heard of 100; is there different SPF rating where you are? In any case, it's been proven that higher SPF ratings don't do much: Is higher SPF in sunblocks better? - Viva Woman
That's why you're better off sticking to the shade and wearing hats and covers rather than plastering on the suncream and standing in the sun.