Not sure how active you want to be, but there are some great guided hikes (Floyen/Ulriken), and fjord kayaking is incredible. Hardangerfjord is a good day trip option, they make a lot of cider so these are common tours. The "Norway in a nutshell" offers a great full day experience (includes the train, bus, fjord cruise and Flam Railway)
August can be wet so I would ensure any of the activities you book have flexible weather policies or cancellation terms.
ETA: Cornelius Sjomatrestaurant is a MUST for dinner, reachable by boat. Pingvinen is a staple for more casual/traditional Bergen cuisine.
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