You should be able to return to fairly normal activity, including going up and down stairs, after your gallbladder removal surgery. You may also want to adjust your diet for a while, cutting back on high-fat foods that may be more difficult for you to digest. You should be able to return to a normal diet within a few weeks.
Daily walks should help you in your recovery, but you should avoid strenuous exercise for a couple of weeks after surgery. Avoid lifting heavy objects for two to four weeks after surgery.