@MrCalvano welcome to drone flight in Canada, you can fly in the yellow but this site gives a bit more information :
Nav Canada drone map
The relevant text is :
Areas filled with yellow require additional caution due to other air traffic.
Clicking on a yellow circle gives you more detail
Basics:
Aerodrome. Drone operations are permitted within the 3 nautical mile zone indicated by the yellow filled circle. Caution is advised, however, due to potential seaplane traffic. Operations when other aircraft are present are strongly discouraged.
Details:
901.47(1) of the Canadian Aviation Regulations states:
"No pilot shall operate a remotely piloted aircraft at or near an aerodrome that is listed in the Canada Flight Supplement or the Water Aerodrome Supplement in a manner that could interfere with an aircraft operating in the established traffic pattern."
The yellow shape on the map shows the most likely areas where aircraft traffic patterns may occur around this aerodrome. Operating in this area is permitted, but not recommended. Drone pilots operating in these areas need to exercise additional caution and vigilance in watching for aircraft traffic.
If you chose to fly in this area and see other aircraft operating it is recommended to land, stop flying, and reassess the situation. If you notice regular aircraft activities here it is recommended to contact the aerodrome operator to better understand the local traffic patterns and to coordinate your operations.
Your problem is they may only be occasionally use floatplane docks or they be very active. The only way to know is to observe air traffic. And even then if it is like BC they can literally come out of nowhere over the trees heading for the lake.