I have 4 kids--13,11, 7 and just turned 2! I would not start the process of potty training until after vacation, unless your schedule while on vacation is as easy to structure as it would be at home. I would say that about any changes that you wanted to make.
I have a 13 year old, who when he was 25 months looked at his new baby sister and said, "diapers are for babies!" and he rarely used a diaper again. T
he daughter, now eleven, refused to go the the potty until I bought her a potty seat with a pink pot...after that you could not get her off of it.
Interest is good, but not every thing. They have to learn what it feels like when they have to go to the potty. It takes a bit of time. I would take her potty now if she asks and praise her a lot when she used the potty.
There is a Bear in the Big Blue House potty training DVD that is good. Also a book called, "I want my Potty" that my daughter thought was hilarious and worked to keep it on her mind.
I hated using pull-ups--but they were just like diapers...I think that now they get cold when they get wet and that might be more helpful. I had the old fashoined training pants and that made the kids more uncomfortable when they have an accident.
Mostly, I think, the children just have to want to be big and want to use a potty. You can train a dog to wait until it is outside to go, so you can make a child wait until you put them on the potty to go--but I think that is why we do not potty train at a year old like our parents and grandparents did. We want the child to know when to go and take care of themselves. It is also a quicker and cleaner process when they learn to go potty.