West Covina is easily navigable by car, and the best way to get around town is by renting a car. The estimated cost for car rental is $30 per day, and gas prices are roughly $3.50 per gallon. The estimated travel time between locations is around 10-15 minutes, as long as traffic is light.
If you have more time, consider taking a hike in the nearby Angeles National Forest or spending a day at Raging Waters water park. If you have less time, skip the golfing or visit only one museum. Remember to bring sunscreen and a hat, as West Covina can get hot in the afternoon!