This station is used a lot. So if you want to park get in early because many commute using this system, so parking may be taken up. Metrolink trains operate Monday thru Friday, five days a week, on all lines.
Saturday service is available on the Antelope Valley and San Bernardino Lines. Sunday service is available on the San Bernardino Line only. Please see this link for information: Metro Link Antelope Valley
This is a wonderful service that is handy if you do not want to have to worry about driving through thick traffic, or park your car, or rent one for that matter. The service takes you right to your airline and picks you up on your return from LAX in Los Angeles. I use this service frequently. Please check out the web site because there is so much information readily available there.
If you need to get around town, the bus service you will look for is the AVTA. If you are headed in from Los Angeles, the AVTA buses will take you for 10 dollars. Weekly and Monthly passes are available.
MetroLink offers train service from Lancaster to Union Station in Los Angeles on Monday - Saturday except holidays. You can leave early in the morning for a day trip to LA and be back by nightfall. The trip takes about two hours, costs a little over $5 (varies depending on when you go and what discounts you qualify for -- visit the Los Angeles MetroLink web site). The trains are very comfortable and the trip is moderately scenic, but at rush hour on weekdays, you should expect a crowd. It is a nice alternative to fighting traffic.
The station is located on Sierra Highway ("zeroth St. East/West") between Ave. I and Ave. J -- it's hard to miss. You can also get connecting transit there to other places in Lancaster or Palmdale via AVTA buses, or even to points north such as Rosamond, Mojave, Bakersfield, California City, and (occasionally) Ridgecrest through Kern Regional Transit.