The Hitchhikers Guide to the Galaxy
The Series of caches is along the River Cole linking the Cole Challenge with the Urban Meets Rural Series. When setting out the caches I have seen many different birds including a green woodpecker, a heron and a kingfisher; surprising given we are well inside the city.
Inspired by the radio series and books this series never quite knows how many there are, so there will be more than a trilogy and some will be hard to understand. An infinite improbability drive should not be required. They can be done individually or as a series. There are no codes to note down for a bonus cache.
Most of the tracks are fairly mud free and are actually tarmaced. Most are fairly easy terrain and should be accessible to buggies and bikes though Zarniwoop and Krikit would require lifting over/up/down steps. There are no stiles on the route and frequent stops for refuelling or relief opportunities.
There are plenty of other caches either along the route or small detours away. As the series is a linier route a possible return route along the roads collecting caches could be done I will leave it up to you to plot a route. A possible starting point would be Sarehole Mill (the car park is waymarked), if you go north and then come back south Hobbit Hide is well worth the effort. Alternatively, the North end of the series is fairly close to Small Heath Station, with Yardley Wood Station near the other end if you don’t fancy retracing your steps. The walk there and back is about 6 miles.
There are several roads to cross the more major ones have crossings but Brook Lane does not so take extra care here. As the series follows the river, care of mini cachers should be taken and if your dogs like swimming then you are likely to get wet.
This Cache
Marvin has scrambled his coordinates and combined them with the meaning of life. It is odd that with the mind the size of a planet why even he cannot keep data in an easy format. He has not stored any of the non numerical data.
35121436424863006356145463
There are some brambles to get past; at the time of placing there was a path through them that did not require Kevlar protection just careful placing of feet.
You can check your answers for this puzzle on 
Congratulations to andycpuk for FTF - especially as the code was incorrect.