Hi Si, While you're around the Lower East Side Area, (which is where Katz's and WD-50 are) you might want to pop in Russ & Daughters. It's a specialty food store on Houston St. that really captures the spirit of that area as an Eastern European/Jewish (is that an accurate depiction?) immigrant community. It's been around for ever and has so many fun foods to check out. Also on that street: Yonah Schimmels Knishery as well. Even if you don't buy anything to eat, if you are on a food inspired New York Vacation, these are both great places that are very New York! Just walking in to them will helps to understand the beginnings of culinary enterprise in this city. Your trip sounds perfect. Welcome and have an amazing time!!