Shane Burrows runs that Utah based info site, goes under "Iceaxe", lots of info all over the state. I did canyoneering light; the black hole ( a paved access hike) a few years back with some of the members and they were friendly and fun.
Scott Patterson on SP is a great resource although he lives in Col.
Mike Kelsey the guidebook writer is a good resource -- firstname.lastname@example.org
Besides what Rob wrote several non tech and tech canyons off North Wash as you drive up 95 north of Lake Powell. Park right off the road and start hiking. Butler, Marinus and Stair canyon are a few. Hog Springs right out of the rest area. Some really technical canyons but some you can at least walk up the lower parts
Grand Gulch is really a pretty canyon complex even if you aren't "into" ruins.
Probably too far away but the Boulder Mail Trail from Boulder to Escalante I consider a really nice pavement access hike for that area that doesn't see a ton of traffic unlike Calf Creek Falls, etc. You can probably get someone in Escalante to drop you off or do it as an in and out. Death Hollow, which you cross is very nice. That hike has great views, great slickrock hiking, variety of terrain, can be a day hike or overnighter.