Rose petals, leaves and bark may be used for tea.  Traditional record suggests all of these teas may be helpful in stemming diarrhea.  Take some rose tea with you on vacation for protection from loose bowel problems.
The fruiting body the rose hip is over rated as a health food.  Most varieties have little edible tissue, typically dry and very seedy.

ROSEWATER:  Rosewater may be made from fragrant rose petals and used in cooking. 

You will need an Erlenmeyer flask (may be ordered from Carolina Biological Supply).  Also, purchase a rubber stopper with a hole in it and about 3 feet of glass tubing.  Use a soldering torch to bend the glass tubing where it comes out of the rubber stopper.  Pass the tubing through a baggy full of ice, and/or a fan can be used to cool the tubing.  Leave a dimension of tubing for a spout, put the spout over a collecting jar.

Next:  Strip fragrant rose petals into the jar, cover with distilled water and place your homemade still on a burner. Bring the water to a simmer, and watch the vapor form in your tube, it will make rosewater droplets that will drip into your collecting jar.

This whole process is demonstrated in the video:  Cooking with Edible Flowers.

CANDIED ROSE PETALS: Rose petals may be candied with sugar dissolved in alcohol. Paint the alcohol/sugar blend onto the petals then let them dry.