I have had front desk employees accept 2 $50 Bonus Bucks for a 2 day stay before. I would submit one at check-in, and then submit one later in your stay, particluarly to front desk employees on a different shift. That's one way to maximize your hotel savings.

This could work also with the $100 BBs. Usually the $100 BBs that I've had are for the regular Marriott and Renaissance hotels.

Refer to threads "Marriott Bonus Bucks - Any Experiences?" and "Bonus Bucks Questions... good for any rate? for other forums."