The Arboretum is an excellent place to take a smal...

The Arboretum is an excellent place to take a small stroll if you need a break from campus or are a returning visitor. Parking is free for a limited time with a pass. Alternatively, you can grab ice cream from the Creamery and make the short walk to the Arboretum with your treats.
The Arboretum changes seasonally (obviously), and my personal favorite times to visit are during tulip season and in late summer when the dune grasses are at full height.
The Arboretum is still under development and will continue expanding for several more years. It is enjoyed freely now, but I believe it will have a visiting cost associated once it is entirely completed.
There are public bathrooms with flush toilets. The bathrooms are fairly well-maintained and cleaned, so there should not be concerns for those who can't hold it. (You don't have to run to the Law building!)