HI,
I can understand wanting to do a different vacation. Like I said. I just got back and am going through withdrawal. Possibly having to return to work has something to do with it too!
As For WEM. The waterpark is fun, slides, bungi jumping, wave pool etc. It is much smaller than anything at WDW of course but you can easily fill a day playing there. I'm sure you could do both the waterpark and the rides in the same day..it depends on your kids and if they will want to leave one activity for the next.
I've actually never done the rides. I'm sure someone on the boards has. Have walked through there. There's a rollar coaster and a bunch of other things.. kind of like midway rides.
summer and holidays will be a bit crowded but nothing like WDW. There is also an ice rink.(if there are any hockey tournaments going on though you won't be able to skate). There is lots of shopping, resturants and a couple food courts. Should keep you busy and the kids happy. There is a hotel directly connected to the mall and others very close by. The Fantasyland Hotel in the mall is really convenient.
Calgary stampede is July 6-15.
http://cs.calgarystampede.com/
Sounds like a fun trip. Make sure you bet to Banff if you go to Calgary. The Rockies are spectacular!
Good luck and feel free to pm me if you have anything specific. I can certainly try to help!
Liz