LetsDoThis, is that an app for a group of people? It'd be interesting if say a group of 5 people want to decide on where to go for lunch, dinner; or where to sightsee on a travel day... I guess the choices need to be granular too, e.g. a steak restaurant would be "Hard No" for some vegans.
I can imagine using a solution without a central server: one member of the group could manually collect and input all the ideas, the app would create a QR code of all the options, all members scan the code, make their choices, and someone can collect the votes from them also by scanning QR codes from their phones.
Alternatively, the data could also be a base64 string shareable via email or WhatsApp, if not all members of the group are nearby..