For hairstyles if the weather is not extremely hot what about some nice loose waves? But if it is very humid that day try and updo, something classy with curls pinned up off your shoulders and back so that you don’t become hot and sweaty.

For the photos try a Matte looking finish to your foundation you don’t want that dewy look to add to any perspiration and you don’t want anything thick. Try soft natural makeup colors nothing sparkly or dark because it doesn’t look very flattering in sunlight. Also have your pressed powder at hand so you can blot some of the moisture away and then touch up your face to prevent that glistening sweaty look. You can also have a cute accordion type fan in case you get hot or those small hand held battery operated fans to help dry off any sweat before photos, just get your maid of honour to carry it in her purse if you won’t have one.

Good Luck.