Hagan Park has quite a bit more than your average park in the area. There's free train rides held by the miniature train enthusiasts, there's a petting zoo with bunnies, donkeys and goats and, as of 2010, there's a new dog park.
This features enormous grassy lawns, drinking fountains and three separate areas to keep the big dogs segregated from the little dogs. One section is usually closed to allow it to rejuvenate while the other areas get tromped on by domestic pets. It's proximity to the American River provides lots of other activities and you could easily find enjoyable activities here throughout the day.
This is the place to be on both 4th of July and Halloween. On the 4th the fireworks are launched from right over the American River. On Halloween there are haunted houses and other fun activities for the kids.
Entering the park costs money but, if you look closely on a map, you may find some places to the east where you can park for free. Street parking is sometimes blocked off during the 4th of July weekend though.
A quick thank you to local Internet Service Provider DSLWest who allowed me to work on this guide during business hours. Visit this Independent business at http://www.DSLWest.com/ from your computer or mobile device.
Tips: beware of rattlesnakes in this area. These pesky reptiles like to sun bathe by the bike path. A $20 dollar venom inoculation each year could save your pet. It saved mine.
If your dog does elect to tangle with a snake you can take the frothy mouthed pup to the Sacramento Veterinary Referral Center at 9801 Old Winery Place which is just down the road. Their number is (916) 362-3111 and they are open 24 hrs. Minimum cost for a visit is $125. http://www.vcasvrc.com/