Most science begins in the mind as an idea or a dream. So it could be said that Science branches from Science Fiction so i'll grant the crossing of line.

The not interfering with other races makes sense but why travel light years just to watch? Unless we are a reality show as depicted in south park.

Anti-matter could be a source of power though harnessing it would be a problem.
Also food. I don't think their are many opportunities for intergalactic drive thrus though if a race is advanced enough to travel that far i guess they would have worked that out.