It really depends on your specific question, but for example, for coastal management:
Quantitative: beach profile/sediment samples (to see the impact of longshore drift/groynes/beach nourishment), wave height/frequency, groyne effectiveness measurements (measuring the height of groyne exposed on both sides, then calculating the difference, used to establish how much longshore drift is taking place and the effectiveness of management)
Qualitative: questionnaire (how effective people in the area think the coastal management is?), bipolar evaluation (e.g. cost, appearance, safety etc.), observations (on appearance and effectiveness when you are at the site, what people say about it), land use
Secondary: possibly articles about storm events in the area and the impact on management, any examples where the management has failed
You could potentially visit two sites near each other and see the impact of one site on the other (e.g. starvation of sediment)
Have you chosen a site yet?