Leave around 5:30 AM for the A8 toward Munich, then the A95 south toward Garmisch-Partenkirchen and Grainau. The drive is roughly 2½–3 hours without traffic, but summer motorway congestion around Munich can add time, so fill up and grab breakfast before leaving. Head directly to the Seilbahn Zugspitze parking area at Eibsee; arrive with plenty of margin for your booked cable-car time, and check the live road and lift conditions before setting off.
Take the cable car from Seilbahn Zugspitze up to Germany’s highest summit. Allow about 2½ hours for the ascent, viewing platforms, and time at the top; fares are typically around €70–80 return per adult, depending on the current ticket and whether other lift services are included. At altitude, weather can be dramatically colder and windier than in the valley, so bring a warm layer, sunglasses, water, and sturdy shoes. After enjoying the summit panoramas, spend around 45 minutes at the Zugspitze Glacier, keeping to marked paths and following staff instructions—glacier access can close in poor weather or unsafe conditions. Have a packed snack or something quick at the summit rather than trying to force a long sit-down meal into the schedule.
Ride back down to Eibsee and walk a relaxed section of the lakeshore for about 1½ hours. The full circuit takes several hours, so don’t attempt it today; instead, follow the easy shoreline paths near the cable-car station, stopping at clearings for views across the turquoise water. Swimming and boating rules vary by season and weather, and the parking area fills quickly, which is another reason to arrive early. Later, drive into Garmisch-Partenkirchen for an early dinner at Restaurant zum Wildschütz—budget roughly €20–35 per person for hearty Bavarian dishes. Reservations are sensible in August, and service may follow German meal hours, so aim for an early table rather than arriving late.
Finish with a gentle stroll along Ludwigstraße in Partenkirchen, where painted façades, old inns, and quiet side lanes give the historic center its character. It is especially pleasant in the evening once the day-trippers have thinned out; allow around 45 minutes and browse the small shops and traditional buildings at an unhurried pace. If you are driving back the same night, avoid extending the walk too late: the return to Gärtringen is again around 2½–3 hours in clear traffic, and the Alpine roads and A8 can be tiring after a full day at altitude.
Leave Garmisch-Partenkirchen around 7:30 AM for Plansee in Tyrol, allowing about 45 minutes via Ehrwald and Reutte. Bring passports or identity cards for the border crossing, swimwear, water shoes, sun protection, and a dry layer—the lake can feel chilly even in August. Arrive early for easier parking and a calmer launch; confirm the exact rental meeting point and weather-dependent opening time with your kayak operator in advance. Allow 3–4 hours for the guided outing, including instruction and time to enjoy the quiet coves and mountain reflections.
After kayaking, stay at Plansee for roughly an hour to swim, photograph the shoreline, or eat a simple picnic before lunch at Gasthof Forelle, right by the lake. Expect around €20–35 per person for regional Austrian dishes; service can be leisurely, so this is a good place not to rush. Later, drive toward Mittenwald and walk Leutaschklamm, the spectacular gorge on the German–Austrian border. The footbridges and metal walkways take about 1½ hours; wear sturdy shoes, and check access conditions after heavy rain. Bring some cash for parking or small entrance charges, and note that the route includes steps and exposed sections.
Finish with coffee and cake at Café Kandinsky in Mittenwald’s colorful historic center—allow about 45 minutes and roughly €8–15 per person. Park outside the pedestrian center and wander the painted façades before settling in; summer closing times can vary, so arrive before early evening rather than relying on a late visit. Depart around 6:00 PM for Gärtringen, taking the A95 toward Munich and then the A8 west, with approximately 2½–3 hours of driving in light traffic. Expect delays around Munich on a summer evening; plan a brief motorway-service stop if needed, and refuel before joining the autobahn if the tank is low.