The expert's are more challenging and require more pushing and slow negotiating. More of a strenuous ride and more walking and pushing is involved. For example, Trestles is an expert trail and it requires the bicycle to go through trees that are not wide enough for the handlebars to go through perpendicular to the trees. I saw others actual go through with out stopping. Other trails pass over small water bodies by traversing small wooden bridges.
Reservations are necessary during peak times and they require payment.
If you cancel the reservation, the fee is not refunded and it is credited for your next trip. Laundry, full hookup camping, paved access roads, heavily shaded with trees, and shrubs separating the sites. Small boats are available for rent to use in the park's lake.