I agree, you wont need much. I took my own toiletries & changed into my own pjs - made me feel better. I was glad I threw in extra pjs & knickers though (you can experience very sudden diarrhoea - unpleasant).
Different surgeons will have different advice & restrictions in regards to activity post surgery & when you can begin more strenuous activity, usually everyone is told to walk - gentle slow walks as you’re able (a couple of short walks every day even just around your home your yard is a good place to begin). Remember you will have restrictions on how much you can carry (lift, pull, etc.) in the first couple of weeks while you are healing. Check with them before embarking on an exercise program.
Oh, those surgical gowns can be thin too. I’ll never forget the man wearing his gown sunning himself in front of the windows in the ward lounge area without a care in the world. The sun was highlighting everything under the gown & believe me when I say he was only wearing his hospital gown. 😱.
all the best.