Not really walking...dinghy trip up the fresh water river! We started at the river mouth (where lat long is) and went over the bar at near high tide. Had minimum 7 ft going over the bar, so could probably do at most tides in a dinghy carefully , except low low tide. Able to go up about 2.5 miles (as the crow flies) until we arrived at some rapids. 2 small settlements, many birds (parakeets, parrots, hornbills, fruit bats. Drifted downriver for an hour. Fun trip, best late in the day or early morning to see the birds.