swim ladder
We have the factory ladder and I'm planning on adding the little plastic steps to it this Spring to make it a little nicer to climb. It's very simple, but I can't think of any other ladder be better (particularly once the steps are on it and not just the metal tubing). Catalina Direct sells the whole package....if you haven't dealt with them before, do it. They'll send you a catalog with virtually every part to your boat in it and lots of cool add-ons. Prices are reasonable too. I added their link below...
