に行くつもりなの

plan to go

→ に
phrase Uncommon #12,063
plan to go Used to ask or explain whether someone plans to go somewhere. The の at the end adds an explanatory or seeking-confirmation tone; なんだ is a more masculine or emphatic variant.
JA: 来週、京都に行くつもりなの?
EN: Are you planning to go to Kyoto next week?

あそこに行くつもりなの

Are you planning to go there?

実はニュージーランド勉強に行くつもりなの

Actually, I’m planning to go to New Zealand to study.

トムと一緒に行くつもりなの

Are you planning to go with Tom?

本当に明日ボストンに行くつもりなの

Are you really planning to go to Boston tomorrow?

トムは本当に独りでボストンに行くつもりなの

Is Tom really planning to go to Boston by himself?

バスでボストンに行くつもりなの

Are you planning to go to Boston by bus?

今年の夏は私たち海外旅行に行くつもりなの

This summer, we're planning to travel abroad.

そのお店に行くつもりなの

Are you planning to go to that store?

外国に行くつもりなの

Are you planning to go abroad?

どこに行くつもりなの

Where are you planning to go?