Harvey is an unattractive industrial area. It is 20 minutes from downtown by car, if driving fast and there are no traffic delays.
Harvey is in Jefferson Parish, which does not have good public transit. However, there are bus routes which serve Harvey and get you to downtown: http://jeffersontransit.org/default.php http://jeffersontransit.org/w2wbexpy.php
You can also take a taxi from your hotel to the Algiers Ferry (al ot less than a taxi to downtown), which crosses the river for $2 and delivers you to the corner of the French Quarter where the Aquarium is located. However, the ferry only operates from morning to early evening so it won't help you getting back to the hotel at 2:00am. http://www.friendsoftheferry.org/
If someone says something to you like ”I bet $5 I can tell you where you got those shoes”, the answer is “I got them on my feet”
There is always music, but the bands change: Go to www.bestofneworleans.com and click on Music then Listings or to www.offbeat.com and click on Listings, then Music.
Music clubs often advertise "No Cover", meaning there is no charge for entering. However, clubs with "No Cover" often require that customers buy a beverage each for every "set" of music (which can be every 20 minutes) so KNOW THE PRICE before you sit down. Clubs do that because some people will sit in the club all evening drinking nothing (clubs only make money from the drinks they sell - not from the music). It is also a good idea to pay for each round of drinks (in clubs on Bourbon Street) as it is delivered so there can't be any confusion at the end of the evening.
An incomplete guide to bars & clubs:
Some famous drinks are VERY potent compared with regular cocktails that have only 1 to 1 ½ ounces of alcohol. For example, a Hurricane is basically 3 or 4 ounces of rum in something like red Kool-Aid, and a Hand Grenade has at least 4 ½ ounces of Everclear + rum + vodka mixed with melon liquor. They don’t necessarily taste like an alcoholic beverage and it is easy to over-indulge.