You might enjoy the bars while you're in Gubeng, and if you want to see some more of the larger Surabaya area, you can catch a ride on the metro at Ngagel Station.
Even though there aren't top sights in Waru, you can explore the larger area and take in top sights like City of Tomorrow. Jump on the metro at Waru Station to see more of the city.
While Genteng might not have many sights to explore, venturing just a little farther will lead you to top things to see and do like Tunjungan Plaza and Surabaya Plaza Shopping Mall.
While visiting Embong Kaliasin, you might make a stop by sights like Surabaya Plaza Shopping Mall and Submarine Monument.
Ketintang is well-liked for its restaurants and shopping. If you're hoping to see more of the larger area, Royal Plaza Surabaya and Surabaya Zoo are some interesting sights nearby to check out.