Create and groom cross country ski trails throughout the river valley for recreation and commuting. The trails can be anchored by 'warm up' shacks and open community fire pits. These warm up shacks can be fixed assets that also offer services in the summer (bike rentals, ice cream...)
A major barrier to enjoying winter is the cost of proper clothing. A good parka and proper winter boots that are actually comfortable to -30 can set you back hundreds of dollars. Maybe make them accessible with rentals/loans for special events? The reverse coat check! The winter tux!