World Dr. is a bust for spectating, so your first option is really the AK parking lot, which is a pretty great spot to find your people, speaking as a runner. Next would be somewhere on Osceola, but that's a little tricky to get to. Outside DHS is an option, as is along the path next to BW. After that, outside the YC/BC is an option, as is World Showcase in EP, if the friend has park admission.
rD does not allow transfers, FYI. IDK what DIS rules are regarding posting on the topic, and I'm not a Moderator, but just wanted to make sure you're aware that as far as rD is concerned, giving or selling your bib to someone else is against their rules.