Boat share is a good entry without the major outlay and useful if you are still working or limited to the amount of holiday time including, as you mentioned kids school hols. This was my route to boating some years ago. Personally I'd go for a members/private syndicate as to avoid management fees, although a managed syndicate is preferred by some folks. Important to have a sound and clearly understood weeks allocation arrangement and most of all a stone wall disputes resolution procedure.
Like having the fire brigade, will probably never need it but good to know it's there.
As others have said, take a good look around for the arrangement that suits you and go for it. Best of luck