Shrooms can be found in any area, however you can't just go pick and eat random ones to trip.
I'd ask you to read through this http://www.shroomery.org/5/Find-Mushrooms
and then if your still interested trying finding and joining a local mycologist group, that way expieranced people can help you identify your finds.
Stay safe and never eat anything without checking first.
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In a safe place, preferably away from 'normal' places filled with people who are not high and busy goign through their day. The nature is a good place, or in your home or a friend's place with whom you feel comfortable.
A better hit?
Well first of all, you don't take a hit of mushrooms.
Second, when you eat mushrooms, the best way to get the effects is to make sure they are fully dried out. It helps if you eat at least 1.5 grams. I don't suggest eating more than 2.5 grams if you aren't that experienced with psilocybin.