Asslam u alaikum
Happy to know that you are going to visit RYK.
RYK is a small city, so you will be disappointed if you think of any activity or visitng places like in big cities.
However a little scope of outing I can suggest you are as follows
1: Go to desert (ROHI) in early morning and feel the nature. Watch rising of sun and the beauti of nature.
2: If possible spend a night in desert. (Although these are not the days for such activities, yet its an adventure). Feel the blessings of Allah. I assure you it will be golden night of yours life.
3:in ROHI, there are many lakes.you can decide to visit them or even you can go for fishing at lakes/ Naala. However some local person should be with you for these activities. As usually these areas are supervised by military or para military forces. However they don't interrupt usually.
4: Go for PUNJNAD HEAD, about 100 KMs from RYK towards Khanpur teseel of RYK.Road condition is excellent. so it would take Max 2 hours of drive. watch Rivers of Punjab hugging each other.
5: You can visit MOO MUBARAK FORT about 12 KMs away. although in ruined condition. still you can spend your a little time their. watch lush green country side of Rahimyar khan.
6: Go to PATTAN MINARA, about 6 KMs from RYK. its a tiny but historical place built many centuries ago.
7: Go to Guddoo Barage in sindh. it will take about 2 hrs of drive. Becarefull of Sindh Police. 
8:You can visit Mighty Indus River at Bangla Ichha. its near JDW and 60 KMs from RYK. it would take an hour of drive. Enjoy nature and Might Indus. If you are lucky enough to find BOAT BRIDGE there. Then cross it. You will enjoy MUD TRACK of about 20 KMs. Enjoy driving there. After 20 KMs there are tombs of Mazari Sardars worth watching. Dont afraid . . .balouchs there are usually helping hands.
9:Go for BHOONG MASJID near BHOONG in Sadiq abad. it would also take an hour of drive. its very beautiful mosque built there. you can spend a little time there.
10: If you want to spend a day long . . .then go for DARAWAR FORT. its near AHMAD PUR SHARQIA near BAHAWALPUR. watch Amazing beautifully constructed Fort and fort mosque and Nawab's Tombs. It would take about 2 hours of drive.
11: Go for RYK Zoo, Although not in good condition.
12: Why dont you walk in markets/bazars? Although not as luxurious as in big cities, yet markets/bazars provides good information about the area. You can spend many hours walking happily in bazars.
I hope you can spend your good time on these places. If any question, you can ask me.
Regards
Badar-ul-zaman