Congrats on your wedding! I got married at the Seven Stars last April and used bougainvillea for my bouquet, corsages, boutonnieres and my centerpieces. I also got them through my package, so it was Niki/the hotel that made arrangements with the florist. I had no problems with anything drooping or wilting, especially the bouquet. The hotel kept the bouquet in the fridge in my room right up until I needed it. And then the whole ceremony and pictures only takes about an hour anyway and then you're basically done with your bouquet. But I also didn't notice any issues with my centerpieces either. If I had any issue, the groom's boutonniere got a little mushed, but I think was mostly from hugs after the ceremony.
I was more concerned that the flowers wouldn't look all that special in arrangements but I couldn't fathom paying to ship flowers in (which is the only other option). Turns out, I absolutely loved my arrangements - bright pop of color, island-y, not too 'done' or formal, but very pretty for my beach wedding. Hope my two cents helps!