Cape Canaveral? When I shot a shuttle launch there (Columbia 5, in 1982), I used three Nikons (2x F2ASs w/Kodachrome 64 and an F3 w/Kodacolor 100), and shot simultaneously with 400mm, 600mm and 800mm lenses (the latter provided by NPS). All three were mounted on a "customized" Majestic tripod, which I panned upward to record the launch, liftoff and initial trajectory. I used a wide angle (24mm or 28mm) to record the contrails afterward. My inclination, based on my experience of shooting at the Cape would be to bring the longest glass you have; a wide angle might be interesting for few pre- and post-launch shots, however, for the launch itself, go long.
Cumberland Island? I shot there in 1985 (F2ASs and an F3HP). As I recall, I packed several wide angles (20mm, 24mm, and 35mm?), a borrowed 28mm Nikkor PC, a 55 Micro-Nikkor, and a couple of telephotos (ranging from 85 mm to 300mm, as well as a 500mm CAT, that stayed in its case). If memory serves, the wide angles, the PC (some nice ruins of the former Robber Barons' homes), the Micro, and the shorter telephotos (85mm and 135mm?) got the most use; the long glass generally remained in my backpack...
Other essentials: A cleaning kit (lots of sand), bug spray or lotion, sunscreen, sunglasses...and water...lots of water.