I feel like walking/cycling: an app for finding a walk/bike ride to suit your needs

I feel like walking/cycling: an app for people (anyone, family, singletons, groups, schools, workers at lunchtime, no matter how old, how unfit or fit) who fancies going out for a walk/bike ride, short or longer, embedding information not currently available, including location on interactive maps, as it is easy to get lost, signage not the clearest, often old and fading if present...

Available filters: how far do you want to walk? Where do you want to walk, riverside, canal side, lake side, pasture, parklands, woods? Do you need benches to rest on, fancy having a go on outdoor keep fit equipment, how near to/far from main roads. Do you want children's activities on the walks, visit children's play areas? Geo-caching?
Map existing similar products/services. What are the gaps/overlaps

None of the information is available on interactive apps:
Milton Keynes cycle/footpaths maps: http://www.milton-keynes.gov.uk/streets-transport-and-parking/cycling/advice-and-information/cycle-routes-and-maps
The Parks Trust's walks http://www.theparkstrust.com/resources/self-guided-walks-rides-and-outings
The Parks Trust's children's activities: http://www.theparkstrust.com/resources/childrens-activity-sheets
The Parks Trust's Cycle routes: http://www.theparkstrust.com/sports-and-activities/cycling
Go Sky Rides: http://www.goskyride.com/milton-keynes
Geocaching Milton Keynes: https://www.geocaching.com/seek/cache_details.aspx?wp=GC2T8QV&title=milton-keynes-parks&guid=710c30b7-fdb8-4ed4-86dc-9d518f30d817
Play Areas in Milton Keynes: http://www.milton-keynes.gov.uk/leisure-tourism-and-culture/parks-and-open-spaces/play-areas
Walking for Health: https://www.walkingforhealth.org.uk/walkfinder/milton-keynes-health-walks
Reactivate MK, fitness activities: http://ow.ly/TIdQK
Crime stats: http://www.ukcrimestats.com/Postcode/
Added feature: public could upload their activity/create competitions

Also involve:
Milton Keynes Ramblers: http://www.mkramblers.org.uk/
Fitbit: https://www.fitbit.com/uk
MK Geeks http://mkgeeknight.co.uk/
Healthwatch MK: http://www.healthwatchmiltonkeynes.co.uk/linkmk-site/
Location to test idea
Milton Keynes - testing with schools - kids have smartphones - testing with people with mental health problems (exercise is beneficial) - testing with people who are overweight and/or have diabetes. Testing with geocaching enthusiasts.

Prototyping; http://www.nesta.org.uk/sites/default/files/prototyping_framework.pdf