Questions & Answers about Я собираюсь поехать к морю с женой летом.
This is about aspect and typical phrasing:
- поехать is perfective and focuses on the single departure / the start of the trip (setting off).
- ехать is imperfective and focuses on the process of traveling (being on the way).
With собираюсь, Russian commonly uses a perfective infinitive like поехать to mean “I plan to go (set off).”
You can say Я собираюсь ехать…, but it more strongly highlights the traveling process (less common in this exact “plan to go” sense).