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MysticKnight
Where's a good place to download a trail map?

http://deepcreekhotsprings.net/dchs/deepcreektopo.html
http://deepcreekhotsprings.net/dchs/spillwaytrail.html

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Is it safe to stay after dark?

It's a day use only area. You really shouldn't stay after dark.

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- Is it easy to hike out in the dark?

After you are familiar with the trail it isn't hard. But I wouldn't recommend it for a first visit.

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- Are there undesirable people that may cause trouble at night?

Sometimes.

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Are most, if not all of the people that go there friendly?

Most people are friendly at the hot springs. Especially during the week.

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Is it okay to bring a girlfriend and go skinny dipping without the fear of some pervert giving us trouble?

You should be fine.