Outdoor kitchens and baths have made their way to being a spotlight  trend.  Outdoor kitchens are very popular, and are especially useful in  summer to keep extra heat out of the house.  Outdoor baths are a little  slower taking off, especially in the US, as we tend to be a bit  conservative.  However, if you live in a more rural area (i.e. NOT in a  neighborhood), these intimate retreats can be very sensual or relaxing  escape.  Outdoor kitchens are wonderful for entertaining, and can add value to your home. Simple outdoor kitchens can consist of a counter top, sink, prep area, shelf storage, and a grill. High-end outdoor kitchens can consist of weather resistant cabinetry, stainless steel appliances (sometimes including wine storage), sinks, pizza ovens, steamers, fryers, the whole nine yards!
This simple kitchen requires minimum space and is easily placed on any size deck or patio that will accept its size. It comes with an integrated grill (in the forefront) and a sink and faucet that connect to your water hose to get water.
A gourmet outdoorsman's delight, this kitchen has all of the finest  accessories: a grill, gas burners, a smoker (on the right side of the  frame), under counter refrigerator, warming ovens, and icemaker.  The  wood cabinetry is treated to be weather resistant, as are the deck and  furnishings.  The drink station in the background has a sink and all the  right equipment for making a summer cocktail.
This kitchen falls into the mid-range as far as pricing goes, but has  tons of counter space and a raised bar for seating a hungry crowd.
A simple kitchen that has a rustic appeal, which makes the space very  welcoming.  The wood burning pizza oven in the background is a family  favorite.
Outdoor Baths are gaining popularity in the US, but have been in other  parts of the world for centuries.  Like their interior counterparts,  these fixtures require access to drain lines, so take that into  consideration before deciding to create your own retreat.  They are  called baths instead of bathrooms because a toilet is rarely ever  included in an exterior space.  The main focal point of these outdoor  spaces is a tub and its fixtures, though some also include a shower as  below:
This simple soaking tub overlooks a gorgeous view of the countryside  below
A tropical paradise and a soothing tub full of fragrant flowers can be intoxicating. This outdoor bath provides privacy as well as a view, but should there be any onlookers at the beach, the window can be closed with a solid panel.
Outdoor spaces are wonderful, but take care to contact a qualified contractor and designer before you start into your project. As mentioned above, drainage, ventilation, electrical, and plumbing issues must be addressed in order to make your dream space function the way you envision it to, and as city codes mandate it to.