Licence first
Check whether you need the national Danish fishing licence for your planned water and method. Do this before the trip, not beside the car in bad signal.
Put proof somewhere easy to access on your phone.
Species and zones
Minimum sizes, closed seasons and protected stream-mouth zones can decide whether a place is fishable.
Use official sources for final decisions. Blog posts and social media should only point you toward what to verify.
Weather and safety
Wind direction, swell, cold water and slippery rocks matter as much as lure choice. If a coast looks dangerous, move.
A good Denmark trip is one you can repeat.