Hi napatraveller,
mawa has already siad about Unawatuna and Hikaduwa, trouble is , with your criteria, those two places are right in the middle of the beaten track.
For accomodation there, last time in Unawatuna, I stayed at .
The Flower Garden Hotel,,,,http://www.hotelflowergarden.com/
Excellent place which I'm sure to return to.
One that includes yoga teachings and practise as well as Ayurvedic is
http://www.pavanel.com/?id=70
There's one more place a little further along the coast that may suit you.
Thats at Polhenna.
Polhenna is like a suburb of Matara which is the next big place along the south coast. Matara is a busy town but Polhenna is a very quiet place with more of a village atmosphere.
It only has a small beach but thats surrounded by a reef where snorkelling is OK.
You don't get many travellers there, mainly local people using the beach . Not sure about hotels there, I know there's one over looking the beach but it's not intrusive . I usually stay in a small family guest house where you'r treated more as part of the family .
Sunil Rest,,, Guest House and Restaurant,
16/3A, 2nd Cross Roads,
Polhenna.........+94-(0)-41-2232164.
Rooms are excellent, all rebuilt since the tsunami and food is home cooked, with fresh ingredients from the market every day.
It wouldn't make much of a dent in your daily budget.
For a peaceful quiet beach with a great guest house, you could go a little further along the coast , just past Matara to a little place called Nilwella, between Dikwella and Tangalle.
The guest house,
The Kadolana Beach Resort,
Bandara Watta,,,Kemagoda,,,,Nilwella..Tel; +94-(0)-41-2256140
My favorite guest house on the coast.
Great beach which is usually empty. If you see anyone else on it, it's usually a few local kids.
I've not tried snorkelling there yet but there is a spot nearby which I'm gonna try in Feb. Walk along to the Blow Hole. As you walk along the footpath to the rock point, on the left there's two beaches, allways empty, which looks promising.
For trekking, from Polhenna into Matara, then a bus from Matara to Haputale or Ella, in the hill country, changing buses in Wellawaya.
Both Ella and Haputele are surrounded by mountains, tea plantations, water falls and forests. Fantastic walking country.
Plenty of places to stay around both of these .
Rod.