hello alianne, Im clueless about Secrets maroma location but I can hel you answering all the other questions definately sunset in july is around 6:30 - 7:00 pm you can pay thew wedding expenses at the Hotel front desk with credit or debit card. for other activities, taxis I suggest to judt keep your us dollars, but make sure to bring enough small bills. otherwise you can just exchange I will say no more than 100 usd, of course pesos will be accepted everywhere. there are some shuttles/taxis at the airport, you can always hire them in advance (of course the hotel will alsways suggest to use their transportation =) look for cancunshuttle.com there are lots of good options with reasonable prices. in july theres of course humidity but is also breezee so you and your guests will be just fine! happy planning and let me know if you have any questions!