need advice about flash and ambiant lighting at night

[emeraldrosephoto]

I need more specific advice about a night wedding I have coming up. I'm fine with the bridal party portraits, already have tons of ideas and know pretty much what I'll do as I went today to the venue at about the same time the wedding will start.

Now for my problem... The wedding is OUTSIDE with only candles to light everything and this is my first night wedding. My bride really wants a lot of atmospheric shots, which I understand, but I'm terrified now. I didn't let her know that, but I need serious advice.

My camera is a Nikon D70 so high ISO's are out of the question as 400 is a lot of noise. I also have a 50mm 1.8 lens which will def. help, but risky as well with no leeway for correct focus. I also have my 18-70 3.5-5.8 (or 5.6 can't remember), but without a flash not too much help lol. I have also my sb-800 with lightstand and umbrella, but have trouble using it in manual as I can never seem to get the settings i want (yes too high tech lol just want to be able to manually set my fstop and apeture on it lol). So if I use the flash I'll loose the background ambiance... unless I get help from you wonderful dgrinners lol.

So basically any ideas and help hints will be greatly appreciated. Ideas on set up and what not. I'm considering hiring an assistant, but will need to train them too. Oh and my bride comes into the courtyard going straight and makes a left around a rectangular pond thing with candles all around and about 3 feet makes another left to walk down the aisle to the 'alter' of 2 pyramid candelabras and the aisle will have some small pillar candles as well. hope that made some sense think a big 'U' .

here's a pic of the site in the day from the angle that would be facing the onlookers. And next to the bush covered black fence.

[zona5101]

Geepers, candlelight, iso 400 and a 1.8 lens and a moving subject,
Can you fire your sb800 off camera wirelessly? I think where there is movement, entrences and such you are going to need your flash. Take your tripod and get some "still life" shots of the candles, tables, etc - mix those in with you fill flashed pictures of the people. Perhaps there will be enough light that once the bridal party is sitted you can touch off a few frames existing light off the tripod. Looks like you can get some high vantage point shots from the balcony. Might be an opportunity to take some existing light pictures exposing for the candle light. People who are moving will blur and that should be an interesting and creative way to capture the moment.
Good luck!