Use this portal to pre-pay for Group Tour guests. 

Enter Number of Guests and click Book Now.  Scroll to foot of page and complete the Purchaser Information panel, Accept the Terms and Conditions,  click the reCAPTCHA box (I'm not a robot), and Continue to Payment.

Credit card holders: Your submission of this transaction certifies the charge was made freely and voluntarily to the Flagler Museum and will not be disputed.