Guernsey is a bit quieter and some respects a lot less an small English town than Jersey.
Hotels – The Imperial is a nice small hotel with a cracking Locals Pub attached to it and pretty good restaurant. The best part are the views overlooking Rocquaine Bay, if you're coming in the summer, this really is the best part of the island with a couple of good beaches in walking distant and easy access to some cracking cliff paths.
Cobo Bay Hotel is also in a good location right on Guernsey's most popular beach, and the pub next door gets very busy.
The Bella Luce has recently been refurbished and is now a boutique style hotel, bit pricey bit good food.
There's a few other nice hotels and lots of self catering places that might float your boat, if you do go Self Catering this will give you plenty more opportunity to try some of the excellent restaurants.