Jpgolds -
I commute every other week to California and stay at the Anaheim Hilton. (I'm here right now!). Here is some information:
Call the hotel and request a park view room. There are over 1500 rooms in the hotel. Depending on the room you get, you can see the castle, mattehorn, Paradise Pier, River Rapids, etc. The best view rooms are -103, -105, -107, -109, -111, -113, -115 (floor number preceeds room number). These room give you a straight look at the park. The 200 series rooms will give you a view pretty specifically of Paradise Pier.
You can see the fireworks from the hotel if you have a park view room in the 100 series (odd rooms only), however you lose the music and they become just fireworks.
Parking is $12/night or $17/valet
Park is walkable (10-15 minutes) or there is a shuttle for $2/day. The shuttle is run by the Anaheim Resort Transit people, the Hilton doesn't get the $2, they turn it over to the transit people.
Starbucks is available in the lower lobby of the resort.
Fitness Center is available for a fee, or if you are a Hilton Honors member, it might be free.
There is a pool and 2 hot tubs.
Please let me know if you have any questions. I'm here the entire week and I stay here 15 nights a month. I love the hotel!