This park is a small piece of the 2217 acre Rancho Ulistac land grant made by Governor Pio Pico in 1845, supposedly named after an Ohlone chief. It is widely accepted that there was an Ohlone settlement around the river at this spot.
The Ulistac Natural Area is a popular place for bird watching, wildlife observation; and of course, geocaching. The 41 acre (16.6 hectare) park is just east of the west side Guadalupe River Trail and is bordered on the west by Lick Mill Blvd, on the north by Tasman Drive and on the south by housing developments. Most recently part of a golf course, it is being restored as an exhibit site for native plants and animals; assisted by irrigation with recycled water. Hours are from sunrise to one-half hour after sunset. There is parking along Lick Mill Blvd on days when there are no Levi's Stadium events. Dogs are permitted only on leash. Note that there is poison oak in abundance in shady spots and winter rains can raise a great crop of thistles.
You can enter from Lick Mill Blvd or from the west-side river trail. The west-side trail is packed gravel suitable for mountain or hybrid bikes. The east-side trail is paved from Alviso to downtown San Jose. Cross the river from the east-side trail at Tasman Drive or the bike/pedestrian bridge further south near the River Oaks VTA light rail station and park-and-ride lot. Both sides of the trail are quite flat aside from street underpasses and are easy hikes or rides. Be warned, though, that trail underpasses may be muddy or flooded after heavy rains. For more information, refer to http://www.ulistac.org/ and the park's page on the waymarking site:
http://www.waymarking.com/waymarks/WMDVNF_Ulistac_Natural_Area_Santa_Clara_CA
The cache is a camo'd plastic jar big enough for small trade goods and a geocoin or two. The present location is in a small live oak adjacent to the trail. Be warned that this park is also an informal doggy walk spot and that you should watch your step. Curious dogs possibly contributed to the demise of previous caches, so this one is hanging above ground about three feet (0.9m) high in leafy cover. Cell phone GPS's seem to have problems here, but it is not a micro and there are not that many spots for it to hide. Initial contents include some small swag and a FTF prize. Mosquitoes can be a nuisance at certain times of the day in spring and summer months.
Congratulations to lel_h and Whirlycrackercat for the FTF!