When moored bow-in the swim platform's a little hard to access, so we have a little two-step stool to get on at the boarding gate
These can be had from Ace Hardware for about $30:
Rubbermaid® Two Step Stool | U.S. Plastic Corp.
or, a similar item from West Marine. The two-step version goes for $190:
WEST MARINE Polyethylene Dock Steps at West Marine
Sure, I know, UV degradation and all that. I did fasten some sturdier non-slip feet to the version I have, but I can buy a half-dozen of the landlubber version for the cost of one "marinized" stepstool.