hi, I have a question for you guys.

I am taking NWA/Delta from New York to Taipei with a stopover in Tokyo, Japan. Is it possible for me to NOT continue on with my flight to Taipei and just enter the country for 3-4 days to travel? Of course, I would forfeit my Tokyo - Taipei leg ticket and would need to book an one-way ticket beforehand. Are there things I should watch out for? I mean, yes, I would def. be without checked-in luggages. Other than that, would immigration allow this type of traveling? Thoughts? Recommendations? Mucho gracias.