Traveling to Busan with a pregnant woman. Please advise on accommodation locations.

We are going on a 3-day, 2-night trip to Busan.
We definitely want to spend one night in Gwangalli, but
I'm not sure whether we should stay in Gwangalli for both nights
or spend one night in Gwangalli and one night somewhere else.
Since she is in her second trimester, we won't be doing any strenuous traveling;
our goal is to visit one nature-oriented spot per day
and visit a few good restaurants.
Since we are coming from Seoul,
we plan to travel using public transportation.
Please give us some advice.