Help at the Aquarium?

Hey all, I've been lurking for the past 2 days or so, and already have learned a ton from you guys... This is a great forum, I'm glad I found it! Anyways, some background first:
I'm a native Chicagoan sent to Sydney for 3 months by the company I work for... I found it a great opportunity, and seeing as how I was always interested in photography, I took a running leap and bought a Nikon D70 Kit along with a 70-300mm G lens, a case, and a tripod. I've been reading up a lot on photography as I've had no training, and I'm starting to understand this stuff pretty well I think (aperature, shutter speed, ISO sensitivity, white balance, bracketing, etc). I'm trying to experiment with all this as I go along.
Anyways, following is a link to some shots I took at the Aquarium in Darling Harbour, can anyone give me some pointers? I was trying to get a good exposure (judging by the histogram/highlights), but of course everything was quite dark in the exhibits and so the ISO was set at 1600 the whole time... I seem to have gotten quite a bit of noise on all the photos, is there any way for me to avoid this short of lugging around a tripod (or monopod, which I probably need to invest in next)? I shot in RAW (another first, experiments, experiments...) hoping I could save the shots, but as it turns out most shots were afflicted by either motion blur (handheld at 1/40 or 1/80 is still a bit rough for me) or noise as it was underexposed and I had overcompensate with exposure in Photoshop. Let me know if you have any ideas/tips/tricks, and sorry for the <b>LONG</b> post!!!
<a href="http://www.flickr.com/photos/acaruso/sets/1163799/">http://www.flickr.com/photos/acaruso/sets/1163799/</a>
Edit: Btw, all the shots were taken with the kits lens (18-70).
I'm a native Chicagoan sent to Sydney for 3 months by the company I work for... I found it a great opportunity, and seeing as how I was always interested in photography, I took a running leap and bought a Nikon D70 Kit along with a 70-300mm G lens, a case, and a tripod. I've been reading up a lot on photography as I've had no training, and I'm starting to understand this stuff pretty well I think (aperature, shutter speed, ISO sensitivity, white balance, bracketing, etc). I'm trying to experiment with all this as I go along.
Anyways, following is a link to some shots I took at the Aquarium in Darling Harbour, can anyone give me some pointers? I was trying to get a good exposure (judging by the histogram/highlights), but of course everything was quite dark in the exhibits and so the ISO was set at 1600 the whole time... I seem to have gotten quite a bit of noise on all the photos, is there any way for me to avoid this short of lugging around a tripod (or monopod, which I probably need to invest in next)? I shot in RAW (another first, experiments, experiments...) hoping I could save the shots, but as it turns out most shots were afflicted by either motion blur (handheld at 1/40 or 1/80 is still a bit rough for me) or noise as it was underexposed and I had overcompensate with exposure in Photoshop. Let me know if you have any ideas/tips/tricks, and sorry for the <b>LONG</b> post!!!
<a href="http://www.flickr.com/photos/acaruso/sets/1163799/">http://www.flickr.com/photos/acaruso/sets/1163799/</a>
Edit: Btw, all the shots were taken with the kits lens (18-70).