Aloe Vera is excellent for sunburn or as an aftersun - very cooling. If you can't grow it, you can get aftersun lotions containing aloe vera but a lot of the time they have so little aloe vera in them, that it is almost misleading to call them aloe vera aftersuns (like Banana Boat - check the ingredients list - aloe vera is right down the list and ingredient lists start with the biggest ingredient first). You can get a tube of gel in Holland and Barrett which contains 99% aloe vera which is really the kind of thing you would need if you wanted to try it.