Mapusua played 74 games for Otago, and 50 games for the Highlanders, before taking his talents to the London Irish club.
He spent five seasons in England, winning the premiership newcomer of the year award in his first season, and the players' player award in the 2008-09 season.
In 2011, Mapusua again moved, this time to Tokyo, where he played three seasons for the Kubota Spears.
''I've lived in major cities for the last eight years, so it's nice being back in Dunedin,'' Mapusua said.
''I like the slower pace - kind of like Samoa, except for the weather.''
After taking a two-month sabbatical, Seilala is easing back into things, playing club rugby at the old stamping ground, Harbour.
''They're really good people down there. It's been a nice way of getting myself back into it,'' Mapusua said.
''It's been good getting back to grassroots rugby and being able to give back to the club.''
He would love to play another couple of games for Otago or the Highlanders, but understands those days could be in the past.
''Super rugby is still attractive for me, but I watch those games and I'm just not sure I could keep up with those young guys any more.''
The 34-year-old hard-running midfielder has always been known for his bustling play.
Following his 2009 season with London Irish, his coach, Tony Booth, even claimed he ''wouldn't swap him for any other player in the world''.
Mapusua will be leaving again soon, but this time for just one season. He will play for another Japanese team, the Kamaishi Sea Waves.
Kamaishi was the scene of horror in 2011 when it was hit by earthquakes and a resultant tsunami that left 1250 city residents dead or missing.
Although Mapusua does not believe Japanese rugby is close to the level in New Zealand yet, he sees it as a league on the rise.
''The rugby is really fast over there, but not very physical.
''With the amount of foreigners playing in Japan now, it's really brought up the level of play. Japanese players are also learning to get stronger in the weight room, and becoming more knowledgeable about the game.''
The midfielder captained Samoa at the 2011 Rugby World Cup, and has 33 international caps under his belt.
He is open to the prospect of continuing to play for Manu Samoa, but understands it needs to prepare for next year's World Cup.
''It's really important for these younger guys to get experience at an international level. Manu Samoa doesn't get to play many test games as it is.
''Another in Samoa against the All Blacks wouldn't hurt.''
Mapusua has been a major advocate of the All Blacks going to play in Samoa for the first time. The idea has been gaining traction recently following increased media attention.
''I think it would be great for the Pacific region, and rugby in general, if the All Blacks were to tour the islands.
''Commercially, it's probably not the best option for them. But in terms of being ambassadors for New Zealand, and what it would do for rugby, it would absolutely be worth it.''
Mapusua points to the strong Pacific contingent within the All Blacks as another strong reason for a tour.
''For a lot of these guys, it would be going home.
''If they came, the whole nation would stop. It would be like a public holiday.
''There is nowhere else the All Blacks could go in the world where they would receive a warmer welcome.''
