If you decide to visit Cozumel, combine some good
deeds with your diving. Undercurrent reader Frank Evans
(Rochester, MN) is asking fellow divers to help out
with Project Cozumel, a volunteer group who travel
to Cozumel at their own expense every spring to put
concrete roofs on houses for poor families. Divers build
in the morning and dive the rest of the day with Blue
Angel Dive Shop. 
Evans and his wife were celebrating their 40th wedding
  anniversary in Cozumel in October 2005 when
  Hurricane Wilma struck. He spent three days walking
  into various neighborhoods and surveying the damage.
  “What struck me most was the attitude of the poor
  people living there,” he says. “They immediately began
  to clean their homes and help their neighbors, but their
  roofs were made of treated cardboard that give no safety
  from the wind and rain of hurricanes.” That inspired
him to start Project Cozumel. 
Last year, 12 volunteers constructed a roof on one
  house, then built a bedroom and bathroom for a teenage
  girl undergoing chemotherapy. “Her parents were
  so happy, they cried the first day we started work,” says
  Evans. Next year’s project will take place February 16-
  23, and Evans needs 20 volunteers to meet the goal of
  putting roofs on four houses. Work starts at 7:30 a.m.
  and stops at noon, then Blue Angel takes the divers
  out on their own afternoon boat. Every volunteer contributes
  $100 for roofing materials and medicines for
  local children, and two churches help out with extra
  supplies. Donations are also accepted, in exchange for
  gift receipts. For more information, contact Evans at
  frankevans@charter.net or (507) 287-8184.  
Even if you’re going to Cozumel some other time,
  locals can still use your donations. Evans says there’s a
  need for clothing, especially childrenswear. If you have
  extra room in your luggage, bring down some extra
  attire and drop it off at the Blue Angel Dive Shop.