I don't believe you'll find anything close to any resorts. Punta Cana is a stretch along the ocean with no major cities nearby. There might be a La Sirena in Hiquey but not sure.
Don't worry about forgetting anything "vital". Everything will still be gorgeous and wonderful I forgot to pack my viel, and it turns out the wedding coordinator had one anyway lol. And it was a better match than what I originally had "Something borrowed" lol
The perfect wedding day is one where you have your family and friends with you who made the effort to travel to be there with you, your man, and a RELAXING day. It still goes by so fast so don't stress about little details. All the little things will soon be forgotten and the only thing you'll remember anyway is spending time with everyone