I am having an outdoor wedding in 2 weeks, anyone with outdoor wedding experience have any advice?

we plan on having a sand ceremony (not unity candle). This is a low budget wedding, and music will be from a laptop with surrounding speakers.?

and ideas or tips will be appreciated..
the laptop will be hooked up to surround sound.. the surround sound is 5.1 but the laptop output is 2.1, but the system would be loud enough i believe.

we have a back up but i really hope we do not have to go indoors, i dont really like small chapel weddings.