Congratulations, @Katrina442 on your lovely sea-side listing! I agree with many of your responses.
While the 4 minute walk is not ideal, setting clear expectations ahead of time can mitigate this. I would be sure these details are everywhere in your listing: in the description, in the blurb that pops up for instant booking (if you provide that), in the check-in procedures, in your scheduled automatic messages (that might go out a week ahead, the night before, etc.).
All the great communication you provide ahead of time though is only good if guests take the time to inform themselves. You will always get guests who are rushed, arriving at the last minute, etc. Of course these guests would likely be arriving in the dark or the rain and will be very surprised by an additional 4 minute walk. An additional in-person, visual sign for last minute guests could help in this situation.
If you are able to add a patio cover to the front porch (in case of rain), then you could add an additional note such as: If your party includes two or more people, some guests find it convenient for one to begin unloading onto the front porch, while another retrieves the key and gets a lay of the land. Adding a digital, smart door lock would also solve the problem most simply!
Allowing guests to pull out the outdoor furniture from storage is not a problem!
Finally, I don't myself give any elaborate welcome gifts, but I do provide some snacks and bottled water. I would especially think some snacks and beverages would be welcome after guests have made an extra 4 minute walk.
I wish you all the best!
~Kelley