R at the end of a word sounds soft. Try to join this 'r' with the following word (startig with a vowel):
ir a - ira (you don't say 'irra')
pasear en - pasearen (not pasearren).
A 'r' following l,n and s sounds "vibrante":
Alrededor
Enrique
Desrizar.
I hope it helps.
