Dates are flexible. This day-by-day plan is provisional until you choose exact travel dates.
Start at Fürstliches Residenzschloss Detmold, a short walk from the central streets. Allow about 1½ hours: you can admire the courtyards and exterior without a ticket, but entry to the rooms is generally by guided tour, so check tour times and availability before setting out. Continue next door to the Lippisches Landesmuseum for around 1½ hours among its regional-history and natural-history collections. Its opening days and hours vary by season, so verify both before you go; budget roughly €5–10 for admission.
Walk a few minutes to Detmolder Hof for regional German cooking. Set aside about an hour and around €20–35 per person; check its current service hours and reserve if you want to be sure of a table. Afterwards, take an unhurried hour through Detmold Old Town: wander the pedestrian streets and squares, looking out for the half-timbered façades around the historic centre.
Head south to Hermannsdenkmal on Grotenburg hill, allowing 1½–2 hours including the journey. A taxi or car takes roughly 10–15 minutes from the centre; check parking and any access restrictions before driving. Public transport can be limited or seasonal, so check the current timetable from Detmold before relying on a bus. The forest setting and monument grounds are the main draw; climbing the tower may require a separate ticket, and access can vary, so confirm conditions ahead of time.
No packing list attached yet.