Day 1 — Mittenwald → Lenggries: from an alpine valley to the lake views of Sylvenstein
🚲 Start in Mittenwald and finish in Lenggries. About 50–56 km, pure riding time around 3.5–4.5 hours, elevation gain approximately 250–450 m: the day generally goes downhill along the valley, but there are rolling sections and local climbs. The surface is mixed but touring-friendly: dedicated Isar-Radweg cycle paths, asphalt, compact gravel, quiet country roads, and sections along the dam/river. Main stops along the way: Krün or Wallgau for coffee and a snack, viewpoints at Sylvensteinsee, then arrival in Lenggries. It is convenient to refill water in Mittenwald before the start, in Krün/Wallgau, and in Lenggries; food and bakeries are available in settlements, while in the more natural stretch between Wallgau and Lenggries services are fewer, so it is better to carry some запас. For an e-bike, it is convenient to start with a full battery; in Mittenwald it is realistic to find charging and service at BikerBahnhof. Route nuances: the route is very beautiful, but alpine weather is changeable even from May to September; after rain, gravel sections may be slower, and headwinds are possible near the reservoir. In the Lenggries area it was officially noted that the Fahrradtunnel am Sylvensteinsee-Damm is open, but before departure it is still worth checking local updates on the condition of cycling infrastructure. Staying overnight in Lenggries makes perfect sense: it is a convenient base with tourist infrastructure, rentals, and a clear continuation of the Isar-Radweg. The day is realistic for an average cycle tourist because the distance is moderate, the route is well known and easy to follow along the Isar valley, and the main challenge is not technical difficulty but distance and changing weather.