Good question - but remember that any non-Apple engraving on your iPod may void the iPod's warranty. Check with the engraving provider before committing to it.
if u want to download apps from places other than itunes then u will first have to jailbreak your ipod, install cydia, then through cydia get installous, which lets you download cracked apps straight...
Yes, I think the iPod nano is good. It works well and is fun to use. I have an iPod nano 5th generation and love it. Even though you can't watch videos on it any iPod nano's, I think they are a good...
Apple does offer engraving for iPods that you order through their website or through their retail stores only. If you purchased an iPod anywhere else your only option is to have another company...
Are you looking for something cheaper, or just something different and less touristy?There is a HUGE difference between going to Oahu and staying around Waikiki/Honolulu and going to the big island...