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https://blocktrades.us
This is a fast way to convert steem

you get steem tokens which people are willing to buy on exchanges like poloniex

My personal experience, Bitrex is better than poloniex

Good question. I'm curious what the best exchange sites are.

You can get money for Steem/ Steem Backed Dollar, yes.
Most of the time you have to convert it to another crypto first. One that supports exchange to real USD, Euro and so on.

And there are Prepaid credit cards that support cryptos to fill them and you get to pay with them as USD and so.

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