If you're looking for a good walk on the Burnaby Mountain campus, there's a great trail map available from the City of Burnaby website. (Direct link to PDF.)

Don't forget that you should get out of your labs/offices sometimes, and that great scientists often credit long walks for some of their inspiration.

If you need a direct goal for your walk, there are a handful of geocaches on SFU's trails. (And here's an explanation of geocaching if you've never heard of it before.)

And if you'd like to range further, here's a guide to a lot of trails around Metro Vancouver.