Start with the experience
Decide whether the priority is beaches, historic towns, islands, food or nature. One trip can combine several interests without crossing the entire country.
Pick your arrival & departure
Look at practical connections before choosing accommodation. A one-way route can save backtracking, but compare transport and rental arrangements first.
Limit your bases
For a week, two or three bases is usually a more comfortable editorial starting point than a different hotel every night. Add nights if you want both an island and inland parks.
Book the critical pieces
Prioritise accommodation, essential transport and any timed admission. Leave space for weather, rest and discoveries instead of booking every hour.