On Monday, 27 July 2020 07:33:50 UTC+1, Charles Longley wrote:
I would think land gear up. It might float indefinitely. Depends on how much foam/wood is in it. I would certainly try and get out as quick as I could.

All the recommendations I've heard, including in for instance Finland and Sweden, say wheel down

It helps break the surface, and otherwise the belly gets grabbed and the glider can get sucked in and turn over.