Build a small gummi ship. Maybe give it the Full Life Gummi as the cockpit, and equip Shield2, just in case. You'd probably want to depart from Deep Jungle, take the warp hole, and pray Monstro does not show up (only worry about Monstro if you had him on the route to Atlantica, as I unfortunately did). You should abuse brake, since you'll be destroying and will have to avoid any items. That mission destroyed my thumb for the day. Good luck.
As for Neverland, they're pretty easy. Brake, shield, and some good weapons (Thunder-G, Thundaga-G, Comet-G, and Ultima-G?; for mission 3) will make it easy.