Mark your so racist you should be ashame of yourself.
I love to perform in parks or beach where everyone is relax and enjoying themself. Familly are the best groups to approach specially to start a day, they are glad that you come entertain their kids and they usualy make enuff noise so everyone around know your doing magics!
I tend to approach people the same way i do with customers with a simple question not too personal but involving their actual state of mind;" Hi, you having a good day?Then, Have you ever seen coin suspended in air like this somwhere else?
And there goes the first coin appearance...
Something simple, a question not as personal as "how are you" but something that involve their state of mind. And a second question wich is the starting point from a routine. This bring deception as well as surprise add a classic gag or 2 within the whole presentation and you have em smile from begining to end.
Anyhow you approach people you will always meet some who doesnt care what you say and even worst some people just will take it as an agression the fact that you talked to them. When it happen to me i dont even bother telling em why i wanted to talk with em. I just wish em a great day or i try to borrow em a dollar!

Sometimes i see them later in the day and they come to me saying hey did you want to do a magic trick? And there it goes again, now i know he is more enclined to listen me and he will pay! lol
Anyway there is a lot of good tips in this topic just pass away from mark's under the belt comments.