"Innen busszal megyunk" is also acceptable or should be acceptable since we can "go by bus" -- meaning "megyunk busszal." Travel is the best verb to use, of course, but we always say "to go" as well.
And what about busszal utazunk? (I can't post a reply right now )
Ja, az meg job. Nekem a "busszal utazunk" tetszik a legjobban.
Duo accepts "innen utazunk busszal."