Most reception halls have rooms that are available for ceremonies.  Who you want to marry you is your own choice.  I've had agnostic friends get married by judges and non-denominational clergy.  While god was never mentioned by the latter, references to a higher 'energy' or 'spirit' were. 

Any cool ceremony ideas?

I don't know if they do this in the US but...

My wife and I got married at a registry office in Edinburgh, Scotland. Registry offices deal with all aspects of births, deaths, marriages and naturalisation and can carry out marriage services on the premises. The one we were at - which is closed now as it's moved to bigger premises - had two marriage suites which could accommodate up to 40 people (the new ones can do up to 100 I think). They are smartly and tastefully decorated, bright and roomy and with all the wedding paraphernalia you'd expect, just no religious trappings at all.

The ceremony is conducted by a registrar who has all the bearing and pomp of a minister but, again, without the religious aspects. The service lasts about 20 minutes although you can book for longer if you want music, etc after which you go through to the private office to sign the register.

We then went to our reception which had all the speeches, eating, drinking and dancing to the wee sma' hours.

A mayor is legally allowed to perform a wedding in PA. My Dad was mayor of Bernville a few years back, and a Christian man was marrying a Jewish woman and they wanted a compromise and found this out.

You could always go on a cruise or something. Ships captains are another option for marriage ceremonies. Can be expensive though.

Blame American television. Canada is a much looser nation in regards to marriage law, and most if not all cruise ship captains I've known of over my life can perform marriages in Canadian waters.

I'm afraid I'm not experienced in this. I agree with the Patrician though, the registry office seems like the obvious solution. But if they don't have them in the US then that's a bugger!

You can also in this country, apply for a liscense for a certain building or area of land to do weddings.

There are also large country houses that can be hired for such events. Some people also have two ceremonies, a major but unofficial one, of their own design and then a quickie registry office one to make it official.

This is probably of absolutely no help to you living in a different legal system.

Margaret Downey owner of the Freethought Society of Greater Philadelphia is licensed and enjoys performing secular weddings.  She's a freethought hero and one of the most important atheist activists of our time.  I can't say enough good things about her.  If you came to the Philly area she would probably do it for free, however you really should pay her.  I would think she would drive up to your location, and the proper thing to do would be to offer her a several hundred dollar fee to do it.  Somewhere between 300-500.  Her number is listed on her site, tell her I referref you, her site is www.fsgp.org  

I speak on assumptions, she might actually have a fee and rules that I don't know about.

I can do weddings. A few years ago I married a couple that didnt want any religuous stuff. Instead they got a guy standing in his boxers in my kitchen with a bottle of whiskey in one hand and a pen in the other hand signing there paperwork. The only thing I asked for for payment was a 12 pack. You want that kind of wedding? I can make that happen!

Yeah Im real cheap. Beer will get almost any result you want out of me. Important thing to remember though is you dont give me my beer until after I have finished my work. My wife has learned this the hard way. She use to give me beer if I told her I would do the dishes. Now she only gives me beer after the dishes have already been done.

Well I can't speak from experience here, although I do find the topic interesting, because my boyfriend and I are both atheists, and also hope to marry someday in the [far] future. (We're 20 year old undergraduate students, who both plan to finish grad or med school before getting hitched - if we manage to stay together that long - so we've got a wayyyys to go.) But hopefully my tidbits of advice will be of some help.

First of all, especially since you are not religious, and are (I assume) avoiding a religious theme or message, it is not necessary you get married in a church. You can get married pretty much anywhere. If you want a simple ceremony, a courthouse or some of the suggestions others have posted would work fine; for a more elaborate event, you could try renting out a garden (depending on the season), a ballroom, or any other local venues for the ceremony and/or reception. I have a cousin who decided to marry his fiancee at a very scenic winery in California's Sonoma Valley area.

Now the "clergy" is a bit trickier. The same cousin and his fiancee chose to have one of their best friends ordained in the Universal Life Church, and he married them off. The two wrote their own vows, also. I thought this was a good option, because the friend was someone they were comfortable with, and knew he wouldn't do anything they didn't want him to.

I don't know if judges or other similar officials are willing to travel to the site of a wedding venue, but if this is a possiblity, that could also work.

Anyways, that's pretty much it for my suggestions, hope this helps!