Just out of curiosity, would this be a legitimate magic item in this game? I don't know if there's something else comparable in the magic item compendium or similar, but it's something I included in my own Q'barra adventure so it occured to me to propose it as a potential item.
Boots of the Marshes: This footgear allows the wearer to move more freely in the marshes. The wearer is able to travel across marshes (including bogs, hedgerows, and undergrowth) at his normal speed, leaving no tracks. In addition, these boots grant the wearer a +5 bonus to swim checks made to move through a bog or escape from quicksand.
Faint abjuration and transmutation; CL 2nd; Craft Wondrous Item, pass without trace, surefooted stride, creator must have 5 ranks in the swim skill; Price 2,500 gp; Weight 1 lb.