Our vacation home is perfectly located:

On a safe beach which was completely redone late 2009
Between Playa Gaviota Azul (crescent shaped shallow and safe, you can even see fish) and Playa Chac Mool
On Kukulcan Bld  Km 9.0 (served by all major bus routes)
Accross the lagoon (wave runners, sailing, pirate ships,ecotours,fishing)
Next to malls and best clubs in Cancun(Senor Frogs, Coco Bongo's, Azucar, Hardrock Café, The City)
The Forum is 3 small buildings away, a short 2-5 minute walk
Convenience stores next to Maralago (marble brown facade) on left (Oxxo has a phone cabin, ATM)

Pharmacy next to OXXO (Ahorro)

How to get around:

By bus: cost 8.5 pesos per person (Feb 2011 price). Exact change preferred.
 GROCERIES:

Take any bus (stops by Oxxo or  by Salvia Hotel), get off at Bonanpak (before first round about; Serpent fountain), walk 1/2 block . There is a Supermart, NEW , similar to Save On Foods in layout, very clean. Take taxi back to Condo for 100 pesos(verify with driver), or cross Kukulcan Bld and take bus back to Girasol with groceries.

There are traditional markets and other food stores but this one is the most conveniently located.

Activities;

Lagoons(sailing, pirate ships,wave runners, fishing)
Snorkelling (the nearest place is Playa Tortugas) or Punta Nizuc

By car (on site car rental) and visit: Or ask at front desk , there are tours, they usually leave 7 am.

Chichen Itza(2.5 hours)
Tulum(2 hours)
Coba
Cenotes(deep underground swimming holes and rivers)
Crocotun; Yucatan's wild animals including crocodiles and monkeys, about 1/2 hour drive
Xel-Ha and X-Caret (expensive but worth it if your time is limited, experience all of Yucatan in one day)
Puerto Morelos; reef; take a boat and go snorkelling
Valladolid (2 hours); MUST SEE: new archaeological site EK BALAM; best preserved facade, Mayan Palace
Playa del Carmen (1hour)
Merida (3.5 hours)

By  boat : Ultramar offers excellent safe transportation from : Gran Puerto,  Playa Tortugas 15$ return per person

or Playa Caracol  17$; short walk  from Girasol, find by Xcaret center and Mocambo restaurant)

Visit Isla Mujeres (take boat as above)
Visit Garrafon Park (dolphins, snorkelling)
On Isla Mujeres (20-30 minutes by boat) you can walk everywhere
There you'll see colourful houses and gorgeous beaches (best is Playa Norte), traditional seafood shacks
Central plaza with food store, nice church and children's playground
Visit the boutiques, particularly the jewellery stores
Buy a coconut on the beach (eventually the seller will come back and crack it open for you!)

Cozumel  from Playa del Carmen (35 minutes by Ultramar, 2009 it cost 90$ return for 2 adults, one child, free for 2 year old)
World renowned snorkelling and  scuba diving
Beautiful architecture and main plaza
Rent a scooter or a car and visit the East Coast(rugged but splendid)
Best beach in Cozumel is Chen Rio (East side, protected and very safe for children)