The booze won't start flowing until after ceremony. We opted for open national bar starting at 230 for our cocktail hour(s). We had people take pics with us from 230-300ish and then a Mexican trio came and played to keep guests entertained. We had the DJ play music after this. We had reception start at 6. We had the wedding coordinator arrange to have extra Tiffany chairs at no cost so people could sit. I think having that much time between ceremony and reception probably sucked for the guests since we didn't want to shuttle them back and forth before the reception. We got extra appetizers for the cocktail hour and I think open bar is better then paying for extra wine / champagne since not everyone drinks that. Also you get the golf cart for 8 hours / if you don't pay for the extra one that they offer for 1000 pesos for 5 hours. Ours was available from 1-9 leaving people stranded (only because it was raining buckets that night) at the palapa till the disco shuttle ran. Because you will have a shorter time between ceremony and reception I don't think you need to worry about open bar until start of reception itself. Do you know when sunset is while you are there? We spent from 315ish till prob 530 when we lost the light. Depends what kind of pics and how far you want to go away from ceremony site.
Oh and I highly recommend people go check out the ceremony site. The wedding coordinator does not take you there (at least ours didn't) and we walked there fairly easily during the day... It's right behind the disco and there is a path from building 24 (I think it was 24) that you can follow. This is where the private beach ceremony is and not the public one.
And you might get talked about how awesome the ruins are to take pics on but I didn't find it very easy to get up to it just walking around let alone in a dress!
Sorry I rambled!!!!!
Thanks for all the info. I believe sunset while I'm there is around 7:15 so I think I should have some light for photos. I just booked Photos In Cancun as my photographer and I am so happy that I am not using the resort photographer. I think I may pay for 1 hour of open bar between ceremony and reception so all my guest can stay in the one area and they don't have to leave and return back to the resort. There is only an hour and a half between both so I think, open bar is a good idea. I am thinking that within the hour I will also have the Mexican Trio play for the 45 minutes.
Thanks again for all the info