Hey Big. Probably a little bit depends on what you're looking for in terms of terrain, resort, food, etc...and how off your fastest route you want to detour. I'd definitely not miss Snowbird...I'm thinking of a day or two there in mid-April after Raptor Assault myself. And for any others reading this...Snowbird is often good thru May or June. Great mountain for snowboarders.
We are a bit of a detour here in Jackson Hole and #1 for many reasons ;-)...but two good options that wouldn't be quite so out of the way are Big Sky/Moonlight Basin in Montana and Grand Targhee in Wyoming. The 'Ghee is basically the west side of the Tetons from Jackson Hole. Pretty much same snow with a bit mellower vibe.
A few lesser known places I'd consider hitting on the way down just off I-15 with very little detour time:
1) Pebble Creek (just a little east of Pocatello, ID). Opened in 1949 and still a little known secret. Don't expect Whistler/Vail/Jackson...it is Idaho. But I think it's worth checking out. After a day on the mountain head south 10 miles and have a soak at Lava Hot Springs.
2) Powder Mountain (just NE of Ogden, UT / about an hour north of SLC). Over 8,000 acres and they cap daily lift ticket sales at 1,500 to reduce skier density. Definitely a place to check out. Pretty sure backcountry guides and cat skiing are options.
3) Snowbasin. East of Ogden. Another one of the Non-SLC resorts with good terrain.
Pomerelle that has gotten some love above is a good family / beginner area.
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If you can hit up Snowbird, Alta, or Brighton.
Alta does not allow snowboarders...so you'll want to cross that off your list. 2nd class citizens. No loss...just a bunch of traversing to get to the goods.
