Fun things to do besides the game:
There is the Mariners Hall of Fame that has video highlights of each player (Jay Buhner, Edgar Martinez) honored. Also, you can practice your play-by-play by recording your call of famous past Mariner moments. There really aren't that many frills to the park though. One note is that I would recommend the tour of Safeco. For $8 on game days you can get a tour at 10:30am or 12:30am. On the tour you get to go down the field level, sit in the dugout, see the press room, and go to the owners suite. A bonus was our 70+ tour guide who was overflowing with baseball knowledge and trivia questions.
Overall impression: B
Safeco is an easy place to like, but hard a place to love. The cheap tickets (which might have been tougher in past/better years), great food, good sightlines, and friendly fans make for a great atmosphere. Also, it truly is a unique experiance to watch Ichiro while eating a Ichiroll. Still, I felt like there was something missing that would make this park truly memorable. In some ways it is better that the park isn't like Wrigley or Fenway in the fact that it makes it more accessible to the average fan. For the overall cost you could probably go to 20 games at Safeco for the same price as 4 games at Fenway. However, if you were going to pick a "last wish" park then I would rather go to a place like Wrigley. But if I had to pick an everyday park then I would pick Safeco. Safeco is the safe choice.