I'm headed to my cousin's destination wedding in Hawaii next month. It'll be her 2nd marriage and the groom's 1st. We didn't get to go to her last wedding (also destination - in Las Vegas) but did send a gift (I think something off her registry ~$100) the first time. I think formal ettiquite says that a gift isn't necessary but I'd like to get them something because I'd personally feel strange otherwise.
They aren't registered anywhere and definitely done need any of that normal housewares. Anybody have ideas on what to get as 2nd marriage gift ideas and how much would you recommend spending? How much should I account for the fact that we're spending money to travel and it's a 2nd marriage for her/already bought a gift last time?

Re: 2nd Wedding Gift Ideas?
To be perfectly honest I've never differentiated between 1st wedding gifts or 2nd, 3rd etc. If the couple is having a reception and I'm an invited guest, then I purchase a gift for them.
As far as what kind of gift, gift cards or cash are my favorites. You never have to worry about them not liking it and they always get exactly what they want.
You could get them something that has their monogram on it. Perhaps something such as an ice bucket, crystal platter, etc. I am sure they have all their china and housewares, but it would be nice to have something from this marriage that would last for awhile.
ETA: Check out Sterling Cut Glass. They have gifts than run from 30$ to 300$+ and they can monogram for you.
Ditto pp. If I'm invited, I always send a gift, whether I go or not. I vary the amount depending on how close of a friend/family they are. I think cash/check is appropriate, especially since you're flying there.
The point is to celebrate their marriage, regardless.
If you're positive they have all of their normal housewares (don't assume - find out) then a nice gift card would be great.
From my personal experience - some of DH's family refused to even come to our wedding because they "already went to one for him". From his side it was treated like it was... nothing, because it was his 2nd. We both found this very hurtful.
As far as having housewares, what little I had was hand-me-downs, and his XW got most of his, so we had very little, but since it was his 2nd, a lot of people assumed we had everything, even though we registered, and we ended up not getting hardly anything we needed.
Honestly, as far as I'm concerned, the fact that people refused to even come hurt WAY more than any gift discrepancies. But just knowing that people made judgements about what to do for our wedding because it was his 2nd is kinda hurtful. The idea is to celebrate THIS couple, THIS marriage. So just try to keep that in mind and do what you think is best.
BTW - re: how much to account for $$ spent on travel - I would consider the fact that you came such a great distance an awesome gift, and would consider anything additional like the icing on the cake.