There are 3 options to access the HappyStays guest app.
While not required, downloading the App is preferred, so you only have to log in one-time.

HappyStays guest guide has all the information you need to prepare for your arrival, enhance the experience during your stay and plan for your checkout. You can find:

Preparations & know what to bring
Access codes & WiFi
Restaurants & happy hours
Activities & water sports
Beach access instructions
Troubleshooting & submit a maintenance request
Check-out link for when you depart

Forward this to all the members in your group so they can also prepare!