Plot bunnies, go away...?

So, I've been enticed by two plot bunnies. I know I should get my priorities right but the want to write is overpowering. Oh wait, I haven't even started writing anything! Anyhoo, I need help to decide on which one I should write. I have two skeletons of stories to consider.

1. Andrew's travelog

Andrew Smith, now 20-year old, is embarking on a trip of a lifetime. Fresh from graduating from MIT (summa cum laude), he's very excited to make his way around the world sans the comfort of first class flights, fine dining, and Hilton double duvets. He'll go to the most far flung locations, off the pesky tourists' track, and he'll do what locals do either to earn money or just for the heck of it. Will he get mugged on the streets of Colombia, or will he be eating exotic cuisines in China? Will he find voluptuous foreign girls or will he run into his mother in more than one occasions? And will he discover his true self at the end of his journey?

I'm thinking of writing this from the first person point of view. Like a proper travelog. There'll be side stories on the characters from the past like how Ryan is coping with the medical school or why Timmy takes the decision to drop out and does what he does now, which is a tad too unsavory...

2. The second one is a completely different story altogether. I get this idea from the recent/current volcano ash skirmish that saw/sees thousands of flights grounded and more people stranded.

Bill is a 42-year old man who is attending a business meeting in Shanghai. Towing him is his wise cracking, insanely gorgeous 16-year old daughter, Nicole. As he makes his way to Shanghai-Pudong Airport to hop on his scheduled flight to London, he finds out all flights into Europe have been cancelled. Normally, he won't mind the trip extension but he has an extremely important conference with his lawyer and his soon-to-be-ex wife's lawyer. The woman in question is Sandra, a fierce, aristocratic woman who eats men for breakfast. If he doesn't make it to the meeting, he's risking losing half of his possessions and also the custody of his children. But his biggest concern is not Sandra; he has a date fixed with his latest girlfriend, Maria who looks very much like Penelope Cruz. If he misses the date, the repercussion is dire.

He re-books his ticket and both of them are now flying back to London via Chicago and New York. This way, he has the chance to visit his estranged son who is now studying in New York City. He'll figure out a way to get back to the Queen's Realm once he gets there.

Little did he know that the journey he and his daughter (who also has her plans-to meet her secret lover in Chicago) is going to be more than what he has bargained for...

So, which one? Should I write both? Knowing my writing speed, it's highly unlikely.