You like baseball? A true fan? Do NOT miss the Cactus League. The Peoria Sports Complex is one of the best of class. Both the Mariners and Padres prepare for the MLB season in Peoria for one glorious month in March. Tickets are cheap. You can go wander around to any one of about a dozen fields to watch both major leaguers and minor league players work on their craft. The weather will be warm and sunny. There are some nice hotels within walking distance of the complex but if you want to stay in one of those you better make your reservation well ahead of time as they book up fast for the month of March.
Last year Ichiro signed for a bunch of people. Bring a sharpie and a baseball, hat, shirt, etc. and someone is going to sign for you, if you are into collecting autographs.
If you have young kids get the General Admission "Grass" seats. They can roam around without bugging people. Fun to roll a baseball back and forth with them too. Bring some strong sunblock or they will burn quickly, which can make for a bad couple of days. Sunglasses also a good idea as my son got eyeburn last time we were there.
I would get to the park when it opens as you can catch batting practice. Amazing displays put on by some of these guys.