You should spend your coins on whatever will make you happiest. I often in my secondary restaurants just get as far as I can in the goals without stressing them, rarely completing them unless I'm motivated by a final prize I love. If you like the sale v-day stuff better than the current CNY goals, then you should definitely get the sale stuff.

Always a good idea to cook profitable dishes and use an efficient layout! Hopefully soon you can both do goals and get items you want.