Strawberry Fair, Cambridge
The most important annual fixture on the Cambridge calendar, this family-friendly festival has music, clowns, jugglers, street theatre, fairground rides, bouncy castle, food stalls and a market. It kicks off with the all-singing, all-dancing Strawberry Parade, which leaves the common at 11.30am, travels through the town and returns to the common for more fun until 10.30pm.

· Midsummer Common, Cambridge. Saturday 5 June, free (01223 560 1601; www.strawberry-fair.org.uk)

Treasure Island week, Isle of Wight
Wightlink's Treasure Island fun takes place at family attraction Blackgang Chine throughout half-term week and guarantees plenty of swashbuckling shenanigans. In their search for the buried treasure, your little pirates will have the chance to win the new Peter Pan video and even the treasure itself. There's also a super-fast water slide, a cowboy town, fairy castle, crooked house and a maze.

· Blackgang Chine, near Chale, Isle of Wight. Until Friday 4 June, £53.50 for four people including entry and day return car ferry from Portsmouth or Lymington with Wightlink (0870 582 7744; www.wightlink.co.uk)

Children's Festival, Reading
There are tons of child-friendly events and activities in this Berkshire town, but the highlight is City Centre Day on Friday 4 June, 11am-4pm, when the city's retailers go all out to keep the children entertained while you do some window shopping. Events include a Harry Potter fancy dress competition, unicycling, juggling, face painting, funfair rides and demonstrations of the skills of dogs for the disabled (apparently these highly trained animals even take the laundry out of the washing machine).

· In and around Reading. Until Sunday 6 June (0118 939 0373; www.reading.gov.uk)

Environmental Day, Gower Peninsula
Children who want to demonstrate their concern for the future of the planet can help create a Tree of Life by hanging a pledge on a specially made tree. They can also take part in environmental workshops (like making musical instruments out of recycled rubbish), sponsor plastic ducks in races, see real ducklings and chicks and watch a blacksmith at work, while you browse the many craft shops. The heritage centre has recently opened an adventure playground on a 'tree camp' theme.

· Gower Heritage Centre, Parkmill, Gower Peninsula, South Wales. Saturday 5 June, £3.70 adults, £2.60 children (01792 371206: www.onebiggarden.com)

Hay Fever Children's Festival, Hay-on-Wye
Stand-up comedy, singing, games, rap, poetry, book readings, drumming workshops, dancing, historical theatre, role play and fancy dress - you name it, it's happening at this year's Hay Fever Children's Festival. Younger children will get the chance to meet characters like Maisy Mouse and Thomas the Tank Engine and the Fat Controller, and will be amazed by the stunts at Giffords Circus. There are also appearances by Children's Laureate Michael Morpurgo and BBC war correspondent Kate Adie.

· Hay-on-Wye, in the Brecon Beacons National Park. Until Sunday 6 June, prices £2-£5 (0870 990 1299; www.hayfestival.com)

Medieval Festival, Helmsley
The ruins of Helmsley Castle are the venue for a medieval feast and festival to celebrate the forthcoming summer and bountiful harvest. Roving actors, minstrels, archery competitions, skittles and quoits will provide 15th-century style fun for all the family, ending with a feast where you're encouraged to indulge in some rather messy medieval table manners.

· Helmsley, North Yorkshire. Today and tomorrow, £5 adults, £4 concessions, £3 children. Family tickets available and English Heritage members free (01439 770442; www.english-heritage.org.uk)

Wildlife Photographer of the Year, Belfast
The winning images from the 2003 Wildlife Photographer of the Year competition, organised by the Natural History Museum and BBC Wildlife magazine, are on display at Belfast's W5 gallery. The 109 best entries from all over the world are featured in this touring exhibition, including winners of the children's category, and make for an educational and entertaining way to spend a few hours. Afterwards, you can explore the rest of the 140 hands-on exhibits at this fun-packed interactive discovery centre.

· The Odyssey, Queens Quay, Belfast. Until 13 June, £6 adults, £4 under 16s, family tickets from £15 (028 9046 7700; www.w5online.co.uk)

Family Weekend, Loch Lomond
As well as the usual funfair rides, cruises, pedalos and mountain biking at Loch Lomond Shores, children can enjoy storytelling, charity face painting and the chance to try canoeing for free over the bank holiday. The Canyou Canoe days (tomorrow only) are run on a first come, first served basis and should be pre-booked (0845 345 4978). Be prepared to get wet. Loch Lomond Shores is 18 miles north-west of Glasgow and is also home to the Maid of the Loch, the last paddle steamer to be built in Scotland and open to visitors.

· Loch Lomond Shores, Loch Lomond, Scotland. Today and tomorrow, free entry but charges for rides and activities (01389 722406; www.lochlomondshores.com)