Lord Parkin
aka emperor
To cancel a Right of Passage (or any 20-turn trade agreement, for that matter... Mutual Protection Pact, Luxury or Strategic Resource trade, Gold-Per-Turn deals), simply go into the diplomacy screen of the country you want to cancel the deal with, click "we would like to propose a deal...", and then in the "negotiation" screen that comes up, click the "Active" button along the bottom bar. Then just click on any trade agreement that has finished to cancel it.
(Trade agreements that you can't cancel - because they haven't yet reached 20 turns - are greyed out.)
As for your other question... I'm not sure what you mean by "trade certain world maps". You have only two options: either you can trade either territory maps (a map just of each player's own national borders) or world maps (a map of everything that player has discovered about the world to date). In either case, you can't trade any maps until you reach a certain advance (Map Making in the original game, and Navigation (?) in Conquests).
And you can't "trade" peace treaties as such... you can only ask for them when you are at war with a civ (it will be the ONLY option in the diplomacy screen, so it's not hard to find
). Of course, if you really want to annoy your neighbours you can force them to "renew" your Peace Treaties (click the "Peace Treaty" option in the same "Active" screen in which you'll find the Right of Passage and so on that I talked about before). But I wouldn't advise that, it really annoys the AI and is a heavy incitement for war. (Of course, if this is your intention then that's fine.)
Hope I made things a bit clearer for you.

As for your other question... I'm not sure what you mean by "trade certain world maps". You have only two options: either you can trade either territory maps (a map just of each player's own national borders) or world maps (a map of everything that player has discovered about the world to date). In either case, you can't trade any maps until you reach a certain advance (Map Making in the original game, and Navigation (?) in Conquests).
And you can't "trade" peace treaties as such... you can only ask for them when you are at war with a civ (it will be the ONLY option in the diplomacy screen, so it's not hard to find

Hope I made things a bit clearer for you.
