Yes, Lake Brienz (Brienzersee) is fully included in the Swiss Travel Pass, making it one of the best value-added features for tourists in 2026. This means holders of a valid pass can hop on any of the regular BLS scheduled boat services between Interlaken Ost and Brienz for free, with no additional ticket required. The pass covers both the standard motor vessels and the historic paddle steamer, the Lötschberg, which offers a nostalgic and incredibly scenic way to view the turquoise waters. You can use the pass for a full 75-minute cruise across the entire lake or use it as a "hop-on, hop-off" service to visit lakeside gems like the Giessbach Falls (though the funicular up to the Grand Hotel Giessbach is usually a separate small fee). In addition to the boat, the Swiss Travel Pass also covers the train lines that run along the northern shore of the lake. It is important to note that you must present your pass to the ticket inspector on board, and if you have a 2nd class pass, you must stay on the lower deck unless you pay for a 1st class upgrade.