how to structure a blog and photos?

[JamieJelly]

Hi all,
I am helping a friend move his static html page journal to a WordPress blog. When I say helping him, I mean doing all of it.

Now I have plenty of experience developing sites etc, but never dealt with blogs before.

His journal is currently set out like this:
Trip 1
- Week 1
- Week 2
- Week 3
- ...

Trip 2
- Week 1
- Week 2
- Week 3
- ...

Trip 3
- Week 1
- Week 2
- Week 3
- ...

Because of the nature of it, I want to keep a similar structure, what is the best way to do this? A new category in WordPress for each trip?

Also, there are plenty of pics to go with each week. How should I incorporate these in to it? Should I look in to using something like Flickr?

HELP