Some conditioners bond to the hair, helping to smooth the cuticle and restore sheen to the hair. Others cut down the static charges of flyaway hair. If you really want to have it done, have a hairdresser do it and make sure they tell you the different options for your hair type. Wear a hat in the sun. The sun dries your hair out, as it bleaches it too.
Hats can be cute.
Wear a bathing cap in pools or in salt water. Comb conditioner in your hair before you put the cap on and then wash your hair afterward. I know you think you will look like a dork, but chlorinated pool water can change your hair color. Dry your hair gently, by blotting and squeezing, not rubbing. Never brush wet hair.