Santa's Village would be worthwhile on an ebike so you can bang out laps, the climb is pretty mellow. it's also about 2 hours from Anaheim (disney). If you're going to be at Disney then Santiago Oaks would be the closest riding spot to you and The Path would be the closest shop to rent bikes. the people at the path are awesome, I would call them and tell them your plans and I bet you could get somebody to show you around, there's some amazing off the menu trails in santiago canyon.