Beer Park is a cool spot to get a drink on the strip with a great view of the Bellagio Fountains, but that's about it. Beers were really expensive (as to be expected on the strip, but still...) and for being called "Beer Park" they really didn't have a plethora of options (many options from the same brands, mostly national brands). I've been many places that feature more beers then this location.
There were some "lawn games" that you could play on the deck including a giant Connect 4. They also had some nice seating areas on the deck area.
The bartender we ordered from wasn't warm and fuzzy, but she got the job done and was able to serve us our drinks. I didn't see anyone receiving table service and was never offered a food menu so I'm not sure what the options are.
I'd stop by here again to check out the Bellagio fountains and maybe enjoy 1 drink, but then I'd head out somewhere else to explore.