I would agree with the addition of Williams to your list. Williams definitely has a critical mass of students involved in outdoorsy activities including skiing and snowboarding plus skating, hiking, climbing, biking, rafting. The campus’s location in the Berkshire mountains means the outdoors is instantly accessible.
Williams’ Outing Club is one of the oldest and largest among LACs. Jiminy Peak, 25 minutes away, is Williams defacto ski/snowboard go-to location, and the Outing Club also sponsors trips throughout the area. Winter Study (or January term) is a great time for snow sports of all kinds.
Williams math & statistics department is highly respected, and I understand that its CS program is solidly placed among its LAC peers. Not my area of expertise, though.