If you are planning an engagement in the forest, wearing red to contrast all the greenery is so worth it. I mean, just look at the results! She definitely stands out and looks incredible! I would highly recommend tailoring the outfits and colours to the location and take into consideration how it will look against the backdrop. Imagine if she was wearing a green dress instead, clearly will not have the same effect.
Lynn Canyon is a fairly big park so there are lots of areas to roam, providing lush greenery and well paved trails and planks. The only drawback is that it can be lot of greenery without much variety. That is where you can get creative and find fun ways to pose and provide prompts. Her beautiful flowy dress provided a huge benefit since she was able to play with it so much. Additionally because they were wearing more formal outfits it provides such a huge contrast on top of the colours that it really stands out. Another thing to consider is the time of day and weather. This day was overcast so it got pretty dark earlier than it would've so keep that in mind and be prepared.