Jung Ceylon always has little events going on, I'm sure they'll have something for Halloween tomorrow. There is a nightly sound and light show in the central open air arena and there are loads of good restaurants to eat at in the day and in the evening.
Jung Ceylon also has a cinema with 4D shows, a magic theatre (Joe Conrad the illusionist) and a nightclub (called Famous nightclub). It has it's own brewery (hidden away behind the Junk boat) and a 16 lane bowling alley. It is also attached to the Millenium hotel.
