Meet road builder and visionary Sam Hill in Portland, town floozies at The Dalles, and a saloon girl in the Grand Salon as you trace the path of Lewis and Clark on the Columbia and Snake Rivers aboard Un-Cruise Adventure’s new replica 1900s coastal steamer, the S.S. Legacy.

Hike up a half dozen or more switchbacks en route to Multnomah Falls, see bald eagles and big horn sheep in Hells Canyon and learn what ultimately became of members of the Corps of Discovery at the Lewis and Clark Interpretive Center.

Along the way, you’ll catch yourself imagining the marvels seen by the explorers more than 200 years ago in this land of towering Douglas firs, steep bluffs, rocky shorelines and mountain volcanoes, including Mt. Hood, white and inscrutable in the distance.

William Clark recorded in his journal on Nov. 7, 1806, “Great joy in camp we are in view of the Ocian, this great Pacific Octean which we been So long anxious to See. and the roreing or noise made by the waves brakeing on the rockey Shores (As I Suppose) may be heard distinctly.”

“We want to immerse our guests further into the history, natural environment and local culture,” said Jill Russell, port captain at Un-Cruise Adventure. “We want to come away with a larger appreciation of how special these places are and with the same wonder that we go into them with.”

To that end, entertainment, onboard presentations and shore tours on Un-Cruise Heritage Adventures are designed to keep passengers steeped in the theme of the voyage. You’ll stroll the pioneer settlement at Fort Walla Walla Museum, catch a live raptor show at the Columbia Gorge Discovery Center and sample wines from Washington’s famed Walla Walla Valley. Onboard, there may be a slideshow on the Oregon Trail, stringing Indian beads to fashion a necklace or bracelet, a talk on the region’s geology — and lots of character re-enactments.

The itinerary sounds busy, but it actually unspools at a leisurely pace. The (included) guided shore excursions are typically planned around lunch aboard the Legacy. Liquor flows freely (fine wine, premium spirits and microbrews are included), and not just at the 5:30 cocktail hour. Twin hot tubs and yoga or stretch classes nurture the impulse to stay relaxed.

There’s no “dressing for dinner,” so casual rules in the dress code department but gourmet holds court in the Klondike Dining Room. Cuisine is inventive, and a dish from land and from sea as well as a vegetarian option are always on the menu: seared duck breast with dried fruit chutney; manchego au gratin sturgeon; creamy avocado linguine with red bell peppers and pine nuts. And for dessert? Gingerbread cake with mascarpone cream, Chocolate Decadence, Rum Ali Babas.

“Three words,” said the captain. “Unrushed, uncrowded, unbelievable.”

With a free massage offered to each guest, here’s another: unwind. You’ll immerse yourself in that pursuit as much as anything else.