Seeing Wild Animals

I think the next grandchild I take will be a girl who will be 13 in
July 2009. We will probably travel in the summer of 2009 - mostly
likely June, because I don't think she's a good enough student to take
her out of school.

She is interested in animals (and boys of course). Ideally I'd take
her where my mom took her dad - on African safari. But I don't think
I want to go to Africa ATM. I'd like to stay in this hemisphere if
possible. I've been to Costa Rica and Belize. If that was the only
option, I'd go back, but I'd rather go somewhere different.

SO - What would be the best bet for a cruise in about June 2009 for
seeing animals with a young teen and her old grandmother?

Is there an Alaskan cruise that we could take? How about someplace in
Central or South America? Or the Galapagos? Or Hawaii?