A colon, not a semicolon, is used to introduce a list of items. A punctuation error occurs when a semicolon is used to introduce.
“We offer accessible wilderness adventures in every season; hiking, rock
climbing, backpacking, snowmobiling, cross-country skiing, and interpretive
hiking trails.”
To correct the error, use a colon after the noun season.
We offer accessible wilderness adventures in every season: hiking, rock
climbing, backpacking, snowmobiling, cross-country skiing, and interpretive
hiking trails.