I spent several summers on my GB 42 Classic with my wife and three kids. We would cruise the Balearic islands in Spain for 2 to 3 months each summer. We also had friends visit us during the day for lunch & sundowners. The boat is very spacious and it is easy to spread-out amongst its several spaces.
We used the fly-bridge a lot. We extended the Bimini with a removable canvas attached to the mast and had folding chairs and a table so several could comfortably sit around there:
We added cushions at the bow which were very popular while cruising or at anchor:
A half-size dish-washer was one of the best additions to the boat:
We even added a compact clothes-washer under the V-berth:
Fans were also useful while in marinas although we mostly anchored-out where they were less needed (these are 220V AC):
A PO replaced the original fridge with these two units. More freezer space would have been useful. We also had an Igloo ice chest which we used when we had visitors over for the day.
We also added a Nick Jackson pipe-davit, specifically designed for the GB 42 Classic, that allowed to bring our heavy dinghy on-board. (We had an Avon 320 Jet that we used for exploration and water-skiing.)
The GB42 Class has a quirky design but I really liked it. The two staterooms were separated by the saloon and each had its own head. The saloon was ample and the fly-bridge spacious and easy to climb to.
Have a great summer cruise!