The cache is not hidden on the sculpture, be kind to the plants, stealth required, and BYOP.
Click here for information about visitor parking on campus and click here for the visitor parking map. Parking is free on Sundays but you will have to pay any other day. The pay to park stations are currently $2 per half hour from 6:30 until 16:00. After 16:00 there is a $6 flat rate which they will refund if you exit within 15 minutes.
I would suggest going on Sunday. The parking is free so you can make a day of it. There are a number of caches on campus besides this one and you'll be able to enjoy the beautiful campus. Swing by Hamilton Library and pick up an Art of UH Manoa pamphlet which will detail the location and history of all the outdoor pieces on campus and visit the UH Manoa Art Gallery which is located in the Art Building not far from this cache's location.