Best AI for single 20somethings???

If that is your price range and you want to do AI, then i would head for the Buenoventura Hotel. If you like to be neat the fun, the action, and the nightlife... this is so close you can crawl home from there. As for the Crowds etc, i am not sure, but with all the cruise ships that come to Vallarta now, you just might have a full boat load of people to party with or to bump into...

have a great time....

8) Tom aka Mr Crown

From your list you can cross off

Villa Varadero
Royal Decameron Costa Flamingos
Allegro Nuevo Vallarta
Samba Vallarta
Palladium Vallarta

These are all about a 30 or so minute cab ride to all the nightlife.

Tom is correct in that the Buenoventura is withing walking/crawling distance from all the nightlife. I would chose the Holiday Inn just because I think it has a better beach area. I have also heard good things about the Canto but in my opinion the beach area is not as nice.

My dos pesos

Las Palmas and the Holiday Inn.

My comments about the Getaway:

http://www.mts.net/~dcdonahu/Getaway/Getaway.html

We have stayed at the Canto twice now and loved it. There seemed to be lots of younger people there and all were having a great time.