We don't know....because you have not told us what ship you are on, and when you will be there and whether you want do to the Iguacu Falls by yourself, and what standard of hotel you want to stay in.....you see without this info we cannot help you at all...
It is always fairly easy to add days on at the end of a cruise but if their are other ports of call after Rio then may not be so easy, but you do need to give more info so others might be able to help you.
Royal Caribbean - Independence of the Seas - 14 Oct 17 - 7nts
Southampton : Gijon : Bilbao : Cherbourg : Paris (Le Havre) : Southampton
Now from £579pp
View All Reduced Royal Caribbean Cruises >>
Click here to see offer
P&O Cruises - Ventura - 13 Nov 17 - 11nts
Southampton : Lisbon : Valencia : Cartagena : Gibraltar : Seville (Cadiz) : Southampton
Now from £599pp Was £639pp
View More 2017 P&O Cruises >
Princess Cruises - Caribbean Princess - 20 Apr 17 - 11nts
Southampton : Guernsey : Cork : Dublin : Hamburg : Rotterdam : Brussels : Paris : Southampton
Now from £999pp Was £1329pp
View Top 10 Offers For Princess Cruises >>