hello I am new here and I need some help, Please...

I have the Canon Rebel 2000 slr film camera and the EF 50MM f/1.8 ll
lens and I love it. but I do need anothe lens, I am going on a cruise
in a few months and I want to shoot some landscape pics and some
family pics. So, I want a zoom lens, but I don't really need a wide
angl lense, I have been thinking about the canon 28-105 USM or the
Canon 29-135is USM or the 75-300MM please help me...and also do I
need an external flash..thank you all so much in advance. Jan G