Riverview Trail, William O'Brien State Park - Winter in Minnesota

Things to do in Marine on St. Croix

A village you can walk end to end in ten minutes, wrapped in river, savanna and forest that can fill a whole weekend.

Photo: Tony Webster from Minneapolis, Minnesota, United States / CC BY-SA 2.0, via Wikimedia Commons

Most of what makes Marine special is outdoors and free: the river, the state park and the historic village itself. Pick a guide below. Each one combines practical advice with live or long-term data — river flow for paddlers, trail lengths measured from the map, and the months when each activity is at its best.

Last reviewed October 1, 2026.

Late Autumn at William O'Brien State Park, Minnesota

State park

William O'Brien State Park

1,520 acres of river bottom, oak savanna and wooded bluffs two miles north of the village — camping, a swimming beach on Lake Alice, and miles of ski trails.

Best: May–October; December–February for skiing

William O'Brien State Park Riverside Trail

On the water

Paddle the St. Croix

A slow, wide, sandy-bottomed stretch of a National Scenic Riverway. How to plan a trip, where to launch, and how to read today's flow.

Best: June–September

MarineMill

History

Marine Mill Historic Site

Stone footings of the first commercial sawmill in Minnesota, on a bluff path above the river. Free, open year-round, a five-minute walk from the general store.

Best: Any time

Marine Historic District 1

Self-guided walk

Historic walking tour

An hour-long loop past the 1870 general store, the 1872 Stone House, the 1888 Village Hall and the mill ruins — with a map and the story behind each stop.

Best: April–November

Snowy Hiking Trail at William O'Brien State Park, Minnesota

Trails

Hiking & cross-country skiing

River-level trails, savanna loops and bluff-top overlooks. Which trail to pick for a 30-minute stroll, a long hike or a winter ski.

Best: Year-round

Wetland Trail Stream - William O'Brien State Park - Minnesota

On the water

Fishing the St. Croix

Smallmouth bass, walleye and northern pike in a clean, rocky river — plus a fishing pier on Lake Alice for kids.

Best: May–October

Spring at William O'Brien State Park, Minnesota

Nature

Wildlife & wildflowers

Thousands of species recorded within a few miles — spring ephemerals in April, warblers in May, monarchs in August, mushrooms in September.

Best: April–October

Railroad Tracks

Day trips

Nearby towns & parks

Stillwater, Scandia's Swedish heritage, the potholes of Taylors Falls and a 50-acre sculpture park — all within half an hour.

Best: Year-round