Same here, a bike ride to Hornsea Mere was our day out, with jam sandwiches and a bottle of water.
My North Hull school used to run an annual trip to Farndale, I didn't even know where it was, but I knew the five day trip cost money, I didn't even take the letter to our parents home and slung it straight in the bin, Someone posted one of the letters on facebook last week, the cost for five days away was just over £2. It may as well have been £2m.
Of course I didn't see it at the time but fortunately did before it was too late, just how much I owed my mam for working to pay for the school trips. Times were hard but she always found the money to pay for trips away.
Another source of adventure was the boys brigade, trips in the 1970s to Wales, Scotland and the lake District were the equivalent to space travel these days. Having to go to church on a Sunday was a small price to pay for the up sides, may have even got me a few credits with the big fella upstairs.

