National Geographic provides some interesting information about American Samoa in general
I haven’t learned of any wheelchair accessible trails here, but heard from the Park Service that: “There is …an area suitable for disabled at Lower Sauma Ridge. There are wayside exhibits installed for reading and a nice view of a national natural landmark in American Samoa.”
They also sent a link to a brochure describing Day Hikes in the Park.
There may well be some easy, if not wheelchair accessible, trails outside of the Park. I hope someone will let me know of them. Send a picture and I will post it with © and credit given to you. As you can see, the only pictures I have of American Samoa are from 33 years ago!