Economy of scale - keep it simple. As someone who does travel a lot and to places all over the globe, the following are my considerations:
1. Take only what you are willing to loose, either accidentally or through customs;
2. Don't take so much that it can't be easily accounted for and stored economically in terms of space. Have a designated storage container for your pipes and tobacco. If possible, remove steams from the pipes to eliminate possible breakage - it happens;
3. Lighters are good, matches are better. Replacement lighter fluid sucks - but Bics and matches are sold everywhere;
4. Your goal is to explore, not smoke. More than three blends becomes a smoking vacation and will eat up time better spent exploring and enjoying. You aren't traveling to smoke, you are smoking to reflect on your travels during down time.
5. Speaking of which, finding places to smoke can be problematic and can eat up a lot of time better spent doing what you came on the trip to do in the first place. Small bowed pipes are better - you can always fill a second bowl if you have the time for a longer smoke;
6. Bring a utility pipe, and bring a fun pipe. Interesting pipes serve as ice breakers and you will be surprised what the natives will do for you if they find you interesting and pleasant. I leverage the novelty of the pipe to my benefit;
7. Bring some money of a pipe or tobacco you might find interesting - no matter where I go, I generally find something worth trying or something that peaks my interest.
8. And once again, less is more. Have fun.