Hi,
Had my honeymoon as a two week cruise round the Caribbean in feb 2009. First thing to say is - it was fantastic! (I was 33 then so not that different to you - and it was my first cruise ever)
I could tell you of all the places we visited, what it was like on the ship etc etc but a big factor for relevancy is which ship/company you going with? They vary quite a lot!
Also, where are your destinations? And how many days at sea have you and how many ports?
Overall, mon, it's no problem. 8-)
be happy to divulge any more info you'd like

The ventura with P&O - it's a family ship as there are kids in the party so not many single women here i think!
So you're going to pull, or for the wedding?

. If it's a family ship it won't be stuffy and black tie all the time... which means if there is a formal night or two it's extra special! (I got me a tux from the charity shop for £20!!). I agree that if you make some effort on other nights at dinner it may get you rewards. After all with over 3000 passengers there should be some worth chatting up!
There should also be a fair amount of entertainment, whether movies, live shows, bands, nightclub etc. Ours also had a casino, bars, shops, fitness places (apparently!) and then there's always the sea! It is very pleasant to spend a while with a cocktail just watching the waves, sky, wildlife etc etc!
Oh and about the food, i agree with the endless amount! One restaurant on ours never closed, merely switched food served. From breakfast to mid morning snacks to lunch to afternoon snacks to dinner, to supper to night time munchies! That was in addition to the formal dining rooms and pizza restaurant

Our ship 'only' had about 2000 passengers so is a fair bit smaller than yours. I presume you've checked out
http://www.pocruises.com/Cruise-Ships/Ventura/Ship-Overview/ for it's features. Wow what a vessel!!

oh and
http://en.wikipedia.org/wiki/MS_VenturaOne tip from our trip tho is take some drinks for your room, or get them in duty free or something. The bar drinks weren't included and were pretty pricey! Plus our home made cocktails seemed much nicer anyway. Oh and we went to the buffet restaurant for free ice, slice, and soft drink mixers.

You will have an amazing time, if you want any tips on the islands, mine would be enjoy the local food and beer, make your own tours rather than book em on the ship and my personal highlights were Barbados and Grenada. We also went to Aruba, Bonaire, Isla Margarita, Grand Cayman, Jamaica, Dominica, Antigua, St Martin, St Thomas & Samana! You could also try the Rough Guide books.
Happy cruising. It's ace!