The short answer
Sol Duc lodging is a seasonal availability problem. The cabins are the best answer if you can get them, because pool access is included for cabin guests and there is no comparable lodge inside this part of Olympic National Park. If the cabins are full, the best fallback depends on whether you want a park-lodge night or practical town services.
The operator's 2026 schedule runs from March 20 through November 1 at noon, with pool access sold in limited 1.5-hour sessions for day visitors. That makes lodging valuable: cabin guests avoid some of the day-use friction, while everyone else should treat pool time like a reservation-sensitive activity.