Istria looks small enough to conquer from one hotel, but a single base creates repeated parking searches and late drives after dinner. This plan uses three two-night stays. Pula handles arrival, Roman archaeology and one southern nature choice. Rovinj supplies two harbour evenings and the west-coast decision between Poreč's mosaics and a slower beach-and-forest day. Motovun moves the final nights inland, where hill-town streets, the Mirna valley and food producers are useful before day visitors arrive and after they leave.
The car is essential for the shape, not for every hour. Collect a compact model at Pula Airport and verify the full insurance, deposit and return conditions before leaving. Park once in each historic town, carry only what the accommodation route can handle and walk the old centres. Larger vehicles bring no benefit on narrow approaches. Anyone unwilling to drive after wine should book tastings with transport, stay at the producer or skip alcohol; rural geography is not permission to improvise.
Two deliberate either-or choices protect the week. From Pula, choose Cape Kamenjak for coves, rough tracks and a weather-led outdoor day, or Brijuni for a scheduled boat from Fažana and a structured national-park visit. From Rovinj, choose Poreč for the UNESCO-listed Euphrasian complex, or keep the day local for Golden Cape, swimming and the archipelago. On the inland segment, Grožnjan pairs naturally with Motovun; Buzet, Hum or Pazin is a replacement direction, not an extra checklist.
The loop finishes at Pula Airport without a fourth hotel. From Motovun, allow a broad return margin for rural roads, refuelling, vehicle inspection and airport procedures. If the flight leaves early, move the final night to Pula and accept losing one inland evening. If arriving from Trieste, Venice or Ljubljana instead, reverse the route only after checking cross-border rental authority and fees. This guide assumes a Croatia pickup and return.