San Antonio Bay

7Pines Resort Ibiza

Not a recommendation, but saw this on booking and looks lovely. It's also a Mr&MrsSmith hotel. 

7 Pines

Hotel El Pins Resort and Spa

Hotel in San Antonio Bay. 20 mins to wedding venue by taxi

El Pins Resort & Spa

Innside by Melia (aka Sol House Ibiza)

Melia group = good brekkie. Sol House in San Antonio Bay is closest to the wedding venue, but all hotels are good. Santa Eularia approx 25-30 euro

Melia - all Ibiza hotels
San Jose

Can XuXu

Boutique hotel just outside San José

Can XuXu

Les Jardins de Palerm

Boutique hotel in the village of San José

Jardines de Palerm
Playa d'En Bossa

Santos

Funky hotel in Playa d'en Bossa

Santos

Torre del Mar

Another cute hotel in Playa d'En Bossa

Hotel Torre del Mar

Grand Palladium White Island Resort & Spa

Uber fancy hotel in Playa d'En Bossa, with a kids club

Grand Palladium White Island Resort & Spa
Family Friendly

Occidental Ibiza

Family friendly hotel in San Antonio Bay

Occidental Ibiza

Hard Rock Hotel

Apparently the best kids club on the island! Should be quiet at the beginning of May. Check with the hotel, but I think big DJ pool parties unlikely.

Hard Rock Hotel Ibiza
Also check out...

The best hotels in Ibiza | White Ibiza – The Ibiza guide

White Ibiza – The Ibiza Hotel guide