Some of the activities available from Mdoroni, both the Pehoni House and the Behewa House:

Snorkelling either at the local Coral Heads or in the Watamu Marine Park
Bird watching either in the Sokoke Forest or up the Creek.
Deep Sea Fishing with Pete Darnborough from Ocean Sports in Watamu
Water Skiing or Diving from the Mnarani Club
Easy Access to Tsavo East Game Park – spend a few night at Kulalu River Camp
Picnic by Lamu Dhow on Bofa beach or Dhow cruise to Takaungu
Sightseeing Arab Ruins at Gede or the Historic Old Town in Mombasa including Fort Jesus.