Avalon is v-e-r-y different from all the other Channel Islands I've been to.
Let's go from worst to best:
1. Golf carts everywhere. No the quiet electric type. The noisy gas burning type. All of town which is very walkable is full of noise and smell from these contraptions 24/7. Terrible.
2. You're pretty much trapped in Avalon if you don't want to pay exuberant prices for tour operators. Walked up Hermit Gulch to the lone pine viewpoint and back via Wrigley. That was OK. You could see peace and quiet and tranquility on the other side of the island. But not for you. The climb up the ridge was something you'd probably want to do once if any.
3. There are no beaches in town to speak of. None. Some in our party went to Descanso Beach. A private beach that let you grace their premises for a fee. They reported rather unpleasant drunk folks at the noisy bar abutting the beach (this was early PM).
4. OK minus snorkeling at Lover's cover and Casino point. Nice abundance of fish, less variety and some kelp at Casino point. Poor visibility in both places, made worse by fish feeding by tour guides(!). Both within walking distance from town which is nice. Casino point on a Sunday looks like a zoo with troupes getting marched off to dive ... thirty feet from shore at a tiny cordoned off area, abutted by boats. In general anywhere you try to swim, the boat parking (with oil leakage and septic tanks) is right beyond you, or they get right of way (at Lover's cove).
A bit of advice for the folks running this island:
1. Ban noisy golf carts. Allow only quiet electric ones. (Do it gradually over a few years, if needed). These carts are ruining your island. I for one will not be back.
2. Get public transportation up to the ridgeline to cater to day hikers. Take us up. Bring us back. Share your island. Don't lock people off into silly dusty jeep tours.
What a disappointment. And expensive too... Despite the hefty expenses we cut the trip a day short. Couldn't stand the noise..