Hi Peter,
As my name may suggest being a (recently emigrated) brit, I hope you have a great trip, I have been visiting for games since 2006 but made a greatly timed decision to arrive for good prior to last season.
Last year, the 12 'Alomar' bar was open on a first come first served basis even if you had the worst tickets in the stadium, I am unsure whether this will be true next season but the view from the front seats in there is terrific - I believe the only thing you have to do is keep drinking during your stay in there, if you are on your own you may have to ask the kind folks next to you to look after your empty seat though when getting a refill or visiting the toilet.
If it is your first trip, a tour of the skydome is a snip at around $15, I got to step on the hallowed turf before it was fully fitted, sit in the dugouts and clubhouse last year.
Oh and if you have difficulty buying the tickets via ticketmaster as I invariably did for Blue jays as well as some US NFL games, you should call the club directly as my UK based credit card would often not be recognised by tickemaster.