With tripods, you have light, sturdy, and good price...now pick two of those.
If you want something light and sturdy, it's likely going to cost you. Having said that, here's a tripod I've recommended in the past. I still use it, and it works pretty well. I'm saving up for something better, but other things pop up.
[ame=http://www.amazon.com/Dolica-AX620B100-62-Inch-Proline-Tripod/dp/B001D60LG8/ref=sr_1_1?ie=UTF8&s=electronics&qid=1281121739&sr=8-1]Amazon.com: Dolica AX620B100 62-Inch Proline Tripod and Ball Head: Electronics[/ame]
If you have some extra money to spend, they have a carbon fiber version for $60 more.
[ame=http://www.amazon.com/Dolica-CX620B104-61-Inch-Proline-Carbon/dp/B001MYL1BA/ref=sr_1_2?ie=UTF8&s=electronics&qid=1281121739&sr=8-2]Amazon.com: Dolica CX620B104 61-Inch Proline Carbon Fiber Tripod with Ball Head: Electronics[/ame]
Just keep in mind that these are very inexpensive, and you do get what you pay for. On mine, you really have to tighten the ball down to get it not to move easily, and a couple of the latches for the legs are sticking really badly. They use plastic hardware in places where metal might be better (most notable, the leg latches). However, if you need a cheap, light, and fairly sturdy tripod, this might be the ticket.
You say you're going to Disney World. I was just there last December. My recommendation is to leave the tripod at home, or maybe only use it day or 2 while you're there. Epcot and Animal Kingdom are probably the best places to use it. I would, however, recommend a monopod instead. A tripod is too bulky and there's just too many people that will bump into it, and it will be very difficult to use well. I've even seen people use Gorilla pods mounted to strollers, and, as long as the kid wasn't in it at the time, that's a great idea. Anyway, just some things to think about.