Yes deem is awesome for mountain biking.
The answer is, it depends on your skill level. The trail is very rough in certain places, and the climbs are very steep. If you do the entire "figure 8" its about 8.5 milrs and takes me about an hour.
We saw mountain bikers there.
Yes, few climbing trails and a few DownHill mtb trails.
Yes to MTBs no to ATVs. The trails are pretty technical, though, as they are very rocky, and some somewhat steep with switchbacks. The hills are composed of basalt rocks, which makes for a lot of scree and loose stones.
Can u ride atvs
Absolutely
Yes you can
Yes
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