Own a surveillance UAV for $10K. Battery powered. 2 hours of surveillance flight. In this article a 250 acre island is surveilled from a neighboring island in 45 minutes: https://www.suasnews.com/2017/05/aeromapper-talon-surveys-entire-island-single-flight/
Pedo Island is only 1.5 miles from St. Thomas Island, a popular tourist spot, and is only 72 acres in area.