Milford-On-Sea is within The New Forest and we recommend that you visit the following official website which has lots of useful information on it;
https://www.thenewforest.co.uk/
There is also Milford-On-Sea's very own website which you can also visit for more things to do and places to eat;
Guide to Visiting Milford on Sea, New Forest (visitmilfordonsea.co.uk)
The New Forest Tour Bus - It only runs in the summer months and is worthwhile to travel to the tops spots on the Open Top Bus.
BEACHES
Opposite the house is Hurst Beach, with colourful beach huts and usually a gathering of swimmers from early in the morning all year round it is just by the Needles Eye Cafe (the kids will spot the ice cream and playground).
Slightly west is Hordle Cliff and a place to grab a coffee at the KIOSK.
Walkable is Barton-On-Sea.
More likely a drive is Highcliffe Beach and from there there are Friars Beach and Avon Beach which are more sandy before lastly reaching Muddeford.
WALKING & CYCLING
Locally there are lots of great walks from a gentle stroll to more of a hike, taking in the areas natural beauty, these links give you some more details;
http://www.visitmilfordonsea.co.uk/walks-from-milford-on-sea/4561216421
https://www.thenewforest.co.uk/things-to-do/walking
http://www.milfordonsea.org/new-forest-walks-cycling/4533946422
HURST CASTLE (part of English Heritage)
Artillery Fortress - Hurst Castle
ON THE WATER
The New Forest Paddle Sport Company is located in Milford-On-Sea.
http://www.thenewforestpaddlesportcompany.co.uk/
HORSE RIDING
If you fancy Horse Riding then nearby in New Milton is the Burley Villa riding stables.
GOLF
There are eleven golf courses in the New Forest, four of which are within a 20 minute drive, the nearest on being Barton-On-Sea golf Club .
https://www.thenewforest.co.uk/things-to-do/activities/golf
Health & Leisure
Swimming Pool - Lymington North Street, Pennington, Lymington, SO41 8FZ
Ten Pin Bowling – Bournemouth or Southampton