You could have 4 half-pints, at which point a pub crawl becomes a possibility.

En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma

Pub crawls are not the gruelling endurance test you might imagine. Maybe they were amongst certain macho types in their late teens, early 20s but I'm past 50 now and a short stroll between beers simply breaks up the scenery and sharpens the thirst.

In Cambridge there's a lovely crawl to be had between 4 pubs where the longest walk is perhaps 15 minutes and the total distance is a leisurely two miles.

however, 17/18 is colchester weekend rather than Cambridge if you want a beer fest. Nevertheless, I'm quite sure that nearer the time something can be found that will meet requirements.

Heck, if you want, york is do-able. which is a town you simply have to visit (still functioning viking drainage systems - like the paris catacombs but without the graffiti)

keep to the Fen Causeway