I was a Cub leader for 6 years until about 3 years ago (I am now an Explorer leader). Some context around activities away from the hut:
1 - cost - I had a budget of 75p per head per week in Cubs, and less now. We are discouraged by the GSL to arrange trip that required additional payment more than once a year, due to the demographic of the group.
2- Volunteers - Leaving the scout hut requires more adults. Whenever I tried to schedule a trip out, even with a term’s notice, even walking distance,
miraculously every parent, grandparent, uncle, aunt,older sibling, and every other adult connected to my Cubs was busy.
3- Time - Our Beaver only meet for an hour, our Cubs for 1.5 hours. That can be pretty limiting.
4- Authorisation - the Scout Association is pretty strict about what you can do with/without various levels of qualification for eg, hillwalking or night away.
5- Our volunteers also have families (young and old) to care for and paid jobs to do - by chance the 2 I currently work with all work shifts, which makes scheduling anything at all challenging at times!
We do have a group camp in the summer, and various section camps throughout the year.