Lada för bröllop nära stockholm?

Hi All, I am trying to arrange a wedding for 120 people in a barn near stockholm next summer. Ideally we would like it to be near water so that we can arrive by boat and then walk to the barn. My fiance and I are currently living in london so we have to keep making trips to stockholm to look at venues...which is getting very expensive! We fell in love with Rosenhanska but it is too far from stockholm unfortunately. Does anyone have any good suggestions? Any help would be really really appreciated! Finally, apologies for my bad swedish but I am still learning so I am using google translate! Thanks