Yes.
If you have a LEGOLAND Silver Annual Pass, you may upgrade your membership to a LEGOLAND Gold or LEGOLAND Platinum Annual Pass.
Current LEGOLAND Silver Annual Pass Member Members can purchase a single-day $20 Water Park admission ticket on the day of their visit.
ANY Play Pass can purchase a $30 single-day Water Park admission ticket if date of visit falls on a Water Park blackout date.
LEGOLAND Gold (formerly Merlin Annual Pass Standard) Members can purchase a $20 Water Park admission ticket if date of visit falls on a Water Park blackout date within the membership.