The "Ice House" (Ishuset) has exhibitions of all kind summertime, mostly by famous contemporary local artists. Do give them a ring in advance to see that they are open if it is the only reason for you to visit Hönö.
A great little museum! Most text in the museum is in Swedish but that won't matter too much to an international visitor as there is so much visual stuff. As you enter, there is a room full of ship models, name plates and a fishing boat's steering house with the characteristic old hammering engine noise of my childhood and indeed great for children. This room has an upstairs part which you mustn't miss since there you will find a great pair of binoculars set on Vinga and its famous lighthouse. Back downstairs there is a periscope and some naval models before you get into the other rooms that include the interior of the fishing boat front you see in this picture, bits on how many local fishermen died in mine explosions during the wars, hunting for archipelago birds and various fishing methods. Then comes the most fascinating room of them all, dedicated to Hönö waters in wartime. Sure, Sweden was so called neutral, but of course the sea outside is close to Denmark and Norway, and was full of German ships and mines. There is a story of Ulven, a famous Swedish submarine that sank, but also of a German submarine and another German ship where lots of items have been salvaged from the sea such as a nazi coffe cup, various medals and ID cards and so on. The men running the museum are very talkative and I'm sure they'd be happy to chat away about their collection.
Little Fotö is visible from Klova harbour and nowadays even has its own bridge. This has made more people settle on the island, whereas before, it was mainly local fishing families (visible in the form of in-breeding which it was known for in Gothenburg). These days, lots of Gothenburg families who want to get out into the archipelago settle here and the views across to Hönö, Vinga and the Gothenburg harbour inlets are gorgeous. There are also a surprising amount of archaeological finds from early settlements here.
A trip to the neighbouring island to the north, which gives the whole municipality (with ten islands) its name is a nice way to spend a day. Here you will find the old 15th century church, a newer church, a heritage farm and lots of nice cafes and restaurants. Of course you will also have great sea views as always and it couldn't be easier getting here as there are bus connections even from Hönö ferry harbour.
Mainly open Sundays in June and July so I haven't visited it but it will give you an insight into everyday life on the island, especially the life not set on fishing. They also run the windmill which you can see from the ferry.
An ancient stone labyrinth, similar to that in my tip about Västerås. Its diametre is 7,5 metres and locally, it is also known as the "Troll Ring" even though people still debate what it has been used for.
Head for the water tower (see second pic) and be rewarded with fantastic views across the archipelago. In this picture, you can see all the way to Vinga lighthouse, a major west coast silhouette. The sunsets here must be spectacular and on a good day you can see to famous yachting centre Marstrand in the north with its fortress. You can see many more pictures from here in the travelogue below.
This is only a small wooden chapel like church, built in 1933-34 but as it is in the middle of the island, you're sure to spot its spire. Its interior is 1920s inspired.