I recently got married @ Iberostar Grand Rose Hall....we had a fairly small wedding (20) & we didn't have a wedding party - so only I walked down the aisle...what I can tell you is that we watched a larger wedding a few days prior & they had a DJ. They had one song for everyone to walk down the aisle (for Family & their wedding party - I believe they had 5-6 couples & a toddler) & then they had Canon in D song for the bride....they used the entrance song the same for the exit song for everyone (over the rainbow). They used one other different song for the signing of paperwork/sand ceremony (I forget the song they used). They DJ played music while they were seated...I don't recall the song(s) while everyone was seated....
As for the DJ - the wind would come and rattle the speakers & cords...so there were a few moments when the music kept fading in & out...it may have just been really windy that day, so it may not happen all the time - but I just wanted to throw that out there, since we did notice that while watching their wedding
We, on the other-hand, had the steel drum band...which I absolutely loved & so did my guests...they played while guests where seated. I was fairly laid back & told my coordinator that I can leave it up to the steel drum band on what they wanted to play...since this was an island wedding & I wanted to incorporate part of the 'feeling' of Jamaica
As a side note, even though we had a Steel Drum Band, they do set up speakers & a microphone (which I'm so thankful they did & I even forgot to ask my coordinator about this) - which is great, because all your guests can hear the entire ceremony!! (I thought that there would only be a speaker & microphone set up if you had a DJ...but they set up a sound system regardless of music choice
Lastly = you're getting married on a beautiful beach, so don't worry about any music disasters...you & your guests will have an amazing time! They do an amazing job @ Iberostar
I hope that helps?!?
Good luck to you