There are beach clothes and beach sandles, but all lakes are only scenery items. How about a lake, beach, or even a glitchen pool area? Since there are no showers or perfume in Ur, the glitchen must smell pretty funky without access to water.
hmmm... I was thinking about this recently myself; all the available water in Ur seems to come from watering cans. And I don't think you can count the ice, since it doesn't seem to melt.
it would be nice to have a little babbling brook to paddle your feet in, or river to fish or boat in, or a cooling artesian spring to quench your thirst on a long journey, or even the occasional shower. The Baths of Bortola! Salatu Showers! Soak Your Grime Off in Groddle!
There might even be sea creatures in Ur. Nessie? I was sure I caught a glimpse of her somewhere...
Have Swimming be a low level, short time skill like penpersoship. You would lose energy at a slightly higher rate, but mood would go up while swimming.