When he lifts the German league trophy on Saturday, it will be the 18th time Alonso has won silverware for both club and country and his third straight Bundesliga title.
As for his future, Alonso plans to pass the test to ride a motorbike, take a break from football and travel with his family.
"I've spent my life trying to squeeze everything into four weeks in summer," he told The Times.
"Now I don't have to play anything. I have weekends for the first time in 18 years. My wife is thrilled."
LAHM: BAYERN TRUE
Having joined as an 11-year-old, Lahm spent his entire career at Bayern, save for a two-year loan spell at Stuttgart from 2003-05.
"As a coach, I rarely had a professional like Philipp Lahm, who worked so intensely, so meticulously and so purposefully every day," said Jupp Heynckes, who led Bayern to the 2013 Champions League, Bundesliga and German Cup treble — the only German club to achieve the feat.
Lahm will lift the Bundesliga trophy for the fifth time as captain and the eighth in his career — equalling the record for most title wins held by Bayern legends Oliver Kahn, Mehmet Scholl and Bastian Schweinsteiger.
This will be his 21st title with Bayern, having also won the German Cup six times, and Saturday's match will be his 517th appearance for Bayern.
"I love his professionalism and his quality. If we had 20 Philipp Lahms we would have no problems," said Bayern's current coach Carlo Ancelotti.
After a decade and 113 appearances, Lahm retired from international football following Germany's 2014 World Cup triumph.
With his second child on the way, Lahm has turned down Bayern's vacant director of sport role and will decide his future after time with his family.
"Philipp is one of the best footballers in the world," said Germany's head coach Joachim Loew.
"I very much hope that he will remain in German football, whatever his role."