a person who takes long walks in the country
"After work, my grandfather often wanders off as a rambler to enjoy the quiet trails in the nearby woods."
a person whose speech or writing is not well organized
"His rambling explanations made it impossible for anyone to follow his point during the meeting."
A recreational walker, a hiker.
"After packing his snacks and map, he set off as an eager rambler to explore the hidden trails in the forest."